How to Clean a Polycarbonate Door Without Scratching It

Rinse first, wash with mild soap and lukewarm water using a clean microfiber cloth, rinse again, and dry with a second clean microfiber. Never wipe a dusty door dry, and never use a scraper, squeegee, shop towel, or abrasive cleaner. On a skid steer, compact track loader, or excavator, almost every scratch comes from grit being dragged across the surface — not from the cleaner itself.

All prices listed are accurate as of November 2026 and may change over time. For current pricing, check the live product pages linked throughout this guide.

A polycarbonate cab door is far tougher than glass against impact — but its surface needs different cleaning habits than glass.

Why Polycarbonate Doors Get Scratched

Polycarbonate — sold under brand names like Lexan®, Makrolon®, and Tuffak® — is the go-to material for forestry doors, cab windshields, and side windows because it absorbs impact instead of shattering. The trade-off is surface hardness. Bare polycarbonate is softer than glass, so anything harder than the surface can leave a mark.

On a working machine, that "anything" is everywhere: sand, dried clay, sawdust, mulch fines, concrete dust, and road grit. When an operator grabs a rag and wipes a dusty door dry, those particles act like sandpaper. That's why the single most important rule in this guide isn't about soap — it's about getting the grit off with water before anything touches the surface.

The other common sources of damage on job sites are tools that work fine on glass but not on plastic: ice scrapers, razor blades, squeegees, stiff brushes, scouring pads, and paper or shop towels. Polycarbonate sheet manufacturers consistently list these as things to avoid.

Hard-Coated vs. Uncoated Polycarbonate: Know What You're Cleaning

Not all polycarbonate doors are the same, and the difference changes which cleaners are safe and whether a scratch can be polished. There are two broad types:

Forestry Doors windshields and doors are hard-coated. They're made from optical-grade polycarbonate and treated with a silicone hard coating after forming, on both sides. That coating is what gives the door its scratch, haze, and yellowing resistance — and protecting it is the whole point of careful cleaning. (Details are on our Forestry Doors FAQ page.)

If you're cleaning an older door, an aftermarket panel from another supplier, or flat sheet cut in a shop, you may not know which type you have. When in doubt, treat it as uncoated and stick to plain dish soap and water. That method is safe on both.

The 5-Step Scratch-Free Cleaning Method

This is the routine to use on any polycarbonate cab door, front windshield, rear window, or side window — skid steer, CTL, excavator, or dozer. Do it in the shade or with the machine parked out of direct sun; cleaning a hot panel in full sun can leave streaks and staining.

What You Need

• A hose or a bucket of clean, lukewarm water (a second bucket for rinsing is better)
• Mild dish soap — a small squeeze per bucket is plenty
• Two or three clean microfiber cloths (one to wash, one to dry, a spare in case one hits the ground)
• Optional: a soft, non-abrasive sponge for heavy mud

Step 1: Flood the Door With Water First

Before any cloth touches the surface, rinse the whole door with plenty of lukewarm water from the top down. Let the water carry off loose dust, sawdust, and sand. On packed-on mud or clay, let water soak it for a minute and rinse again — don't pick at it with your fingers or a tool.

Step 2: Wash Gently With Soapy Water

Soak a clean microfiber in mild soapy water and wash with light pressure, working top to bottom. Let the soap and cloth do the work; pressing hard only grinds in any grit you missed. Rinse the cloth often, and change the bucket water when it gets cloudy. If the cloth drops on the ground, it's done — swap to a clean one.

Step 3: Rinse Thoroughly

Rinse all soap off with clean water, paying attention to the edges, the seal line, and any hardware. Cleaner residue left on the surface — especially along uncoated edges — is what you're trying to avoid.

Step 4: Dry With a Clean, Dry Microfiber

Blot or wipe dry with a fresh microfiber to prevent water spots. Use light pressure and a clean section of the cloth as you go.

Step 5: Do the Inside Too

The inside of the door collects cab dust, dirt off boots, and fingerprints. It gets scratched the same way — by dry wiping. Use the same method with a damp, soapy microfiber, then a damp rinse cloth, then a dry one. Keep excess water off cab electronics and controls.

Safe Cleaners vs. What to Never Use

Here's the confusing part: some websites say "never use Windex or 409 on polycarbonate," while hard-coat manufacturers list those same products as compatible. Both are right — for different materials. Bare polycarbonate is sensitive to ammonia and alcohol. Hard-coated polycarbonate has been lab-tested against a much wider list of household cleaners and solvents.

A few rules apply no matter what you use:

• Don't let any cleaner sit and dry on the surface. Apply, wipe, rinse.
• Don't use cleaners or solvents in direct sun or on a hot panel.
• Test anything new in a lower corner first. Lab compatibility doesn't guarantee field results.
• Keep shop chemicals away from the cab. Brake cleaner overspray, fuel, and hydraulic-line degreaser are common sources of hazing and crazing (fine surface cracks) on polycarbonate.

Wiping tools matter as much as chemicals. Use microfiber or a soft, non-abrasive sponge. Skip paper towels, shop towels, rags of unknown history, squeegees, scrapers, razor blades, and brushes.

How to Remove Sap, Grease, Mud, Stickers & Paint

Forestry and land-clearing work puts a lot more on a door than dust. Always start with a full rinse (Step 1), then spot-treat. After any solvent, rinse immediately with lukewarm water and dry.

If your door is uncoated or you're not sure, skip the solvents and stick with soap, water, and patience.

Pressure Washers and the Wash Bay

This is where most real-world damage happens. The machine comes in muddy, someone grabs the pressure washer, and the front door gets hit at close range with a narrow tip and degreaser.

Hand washing is the safest method, and some hard-coat sheet manufacturers advise against pressure washing coated panels at all. If the door is going to get washed along with the machine, limit the risk:

• Rinse only. Use the washer to float off loose dirt, then finish the door by hand.
• Widest fan tip, lowest pressure. Never use a zero-degree, turbo, or rotary nozzle on the door.
• Stand well back and keep the wand moving. Don't dwell on one spot.
• Don't blast the edges, seals, or bonded joint at close range. That's where water and pressure do the most damage.
• No degreaser or truck-wash chemical on the door. Many heavy-duty degreasers are strongly alkaline or solvent-based. Mask the door off or wash it separately.
• Never wash a hot door in full sun with chemicals on it.

Worth noting for fleet and rental owners: write this into your wash-bay procedure. One careless pass with a narrow tip can undo years of careful cleaning — and it's the kind of damage that gets blamed on the door, not the washer.

Ice, Frost & Wipers

Never Use an Ice Scraper

An ice scraper is just a scraper, and scrapers permanently scratch polycarbonate. In cold weather, let the cab heater or defroster clear the door, or melt frost with lukewarm (not hot) water and dry it with a microfiber. Brushing snow off with a gloved hand is fine; chipping at ice is not.

Wipers Are Safe — If the Blades Are Clean

Wipers are safe to use on Forestry Doors windshields thanks to the hard coating, but a wiper blade with a rock, stick, or caked grit stuck in it will drag that debris across the surface. Inspect and wipe the blades clean regularly, replace worn or torn blades, and avoid running the wipers across a dry, dusty windshield — wet it first.

Already Scratched? What You Can and Can't Fix

Be realistic about scratch repair, because the wrong fix makes things worse.

On a Hard-Coated Door (Including Forestry Doors)

• The coating cannot be reworked. Once a scratch goes through it, it can't be polished back to new.
• Do not buff or sand. Abrasive scratch removers (such as Novus® #2 or #3), rubbing compound, and headlight-restoration kits strip the hard coat around the scratch, leaving a hazy, softer patch that scratches more easily and can distort your view.
• Very light marks can be made less noticeable with a non-abrasive plastic cleaner/polish such as Novus® #1. It improves appearance; it does not remove the scratch.

On an Uncoated Door

• Fine scratches can sometimes be reduced with a fine plastic scratch remover like Novus® #2, followed by Novus® #1.
• Heavy-scratch compounds like Novus® #3 are made for acrylic and are not recommended on polycarbonate.
• Deep gouges from rocks, tools, or limbs can't be repaired by polishing.

When It's Time to Replace the Door

If scratches, haze, or crazing are affecting your view of the attachment, the work area, or people on the ground, cleaning isn't the fix anymore — that's a visibility and safety problem. Forestry Doors carries polycarbonate replacement windshields and doors for most major skid steer, CTL, and excavator brands.

Kubota SVL Front Windshield Polycarbonate Replacement

From $499.00

Hard-coated polycarbonate front windshield for the Kubota SVL65–SVL97, replacing OEM V0621-34520. The fix when the old door is too scratched or hazed to see through safely.

View Kubota SVL Windshield →

Bobcat M Series Windshield Replacement Only

From $592.00

Polycarbonate windshield for Bobcat M Series loaders (S450–T870). Drops into your existing frame when the current windshield is beyond cleaning.

View Bobcat M Windshield →

John Deere G Series Windshield Replacement Only

From $592.00

Polycarbonate windshield for John Deere G Series skid steers and CTLs. A straight swap for a scratched or hazed front windshield.

View John Deere G Windshield →

Don't see your machine? Browse all skid steer doors by brand or request a quote for your make and model.

A Simple Polycarbonate Door Care Schedule

Most door damage comes from habits, not single events. Put this schedule in front of every operator who runs the machine.

A worn door seal is an easy fix that keeps the cab — and the inside of your windshield — cleaner:

John Deere Skid Steer Door Seal

$79.95

Replacement door seal for John Deere skid steers. Seals are also available for Bobcat G, M, and R Series, Caterpillar 200 and C/D Series, and Wacker Neuson ST/SW.

Shop All Door Seals →

FAQ: Cleaning Polycarbonate Cab Doors

The Bottom Line

Cleaning a polycarbonate door without scratching it comes down to one habit: get the grit off with water before anything touches the surface. Wash with mild soap and microfiber, rinse, dry with a clean cloth, and keep scrapers, shop towels, abrasives, and shop chemicals away from it. Hard-coated doors like Forestry Doors windshields tolerate more cleaners, but the coating can't be polished back once it's damaged — so protect it. And if your door is already too scratched or hazed to see through clearly, don't fight it; replace it and start the new one off with the right routine.

Still deciding on a replacement? See our guides on polycarbonate vs. glass for skid steer and excavator windows, tinted vs. clear skid steer windshields, and how thick a skid steer polycarbonate door should be.