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Clear Vision: Windscreen Claying and Rain Repellent Checklist

Red dust, creek crossings, and corrugated roads don't just test your 4WD—they test your cleaning game. Most people get it wrong.

Tired of wipers smearing red dust and bug guts across your glass? Here is exactly how to deep-clean your windscreen and apply a repellent that actually lasts in the Aussie heat.

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Sarah Chen Interior & Leather Specialist
| Updated: 5 March 2026
Clear Vision: Windscreen Claying and Rain Repellent Checklist

Aussie Conditions

Aussie red dust is iron-rich and bonds to paint. A regular rinse won't cut it—you need proper pre-wash and pH-neutral soap to avoid scratching.
Quick Summary

Look, most people reckon a quick squirt of Windex is enough, but if you've ever driven into a sunset with a greasy windscreen, you know that's rubbish. This guide is for the blokes and ladies who want their glass so slick that rain beads off at 60 clicks. I've been doing this for 15 years and honestly, the prep work is where everyone messes up. Follow this and your wipers will actually do their job for once.

01

The Right Gear (Don't Skimp Here)

What You'll Need

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Quality Glass Cleaner — I use Stoner Invisible Glass. Avoid anything with ammonia if you have tint.
Fine Grade Clay Bar or Clay Mitt — Essential for pulling out that embedded red dust and baked-on bug jerky.
Clay Lubricant — Dedicated lube is best, but soapy water in a spray bottle works in a pinch.
Glass Polish (Optional but recommended) — Something like Autoglym Glass Polish to strip old oils and water spots.
Isopropyl Alcohol (IPA) / Prep Spray — A 50/50 mix with water to ensure the glass is surgically clean.
Rain Repellent / Glass Coating — Glaco is my go-to for longevity, or Bowden's Own Bead Machine for ease of use.
Stack of Microfibre Cloths — At least 4. Use the low-pile 'waffle weave' ones for glass if you've got 'em.
Fresh Wiper Blades — No point coating the glass then dragging old, crusty rubber over it.
02

Pre-Start Checklist

What You'll Need

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Park in the shade — Never do this on hot glass in the sun. It'll streak like mad and bake the product on.
Check for rock chips — If you've got a crack, be careful. Pressure or chemicals can make it spread.
Lift the wipers — Get them out of the way. Give the rubber a wipe with a damp cloth too.
Wash the car first — Don't start on a dusty car or you'll just scratch the paint around the glass.
03

The Step-by-Step Process

Tap each step to mark complete
01

Deep Clean

Spray the glass heavily and wipe down to remove surface grime. I once saw a mate try to clay a dry screen, sounded like sandpaper. Don't be that guy.

02

Clay the Glass

Use plenty of lube and slide the clay bar over the glass. You'll feel it 'grabbing' at first, then it'll go smooth as silk. That's the contamination gone.

03

Polish (The Secret Sauce)

Apply a pea-sized amount of glass polish to an applicator. Work in circles. This removes those stubborn 'ghost' marks from old wiper blades and mineral deposits.

04

The IPA Wipe

Mist your alcohol mix over the screen and wipe off with a fresh cloth. This strips every bit of leftover polish oil so the repellent can actually bond.

05

Apply Repellent

Apply your chosen coating in overlapping passes. I reckon two thin coats are always better than one thick, gloopy one. Follow the bottle's flash times.

06

Buff to Clarity

Once it hazes (usually 5-10 mins), buff it off with a clean microfibre. If it's stubborn, a tiny mist of water on your cloth helps level it out.

04

Final Inspection

What You'll Need

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Check for high spots — Look at the glass from an angle in the light. Any 'rainbow' smears need more buffing.
Inspect the wiper cowl — Make sure you haven't left white polish residue on the black plastic trim (it looks cheap).
Clean the wiper blades — Wipe the blade edges with your IPA cloth until no more black gunk comes off.

A Few Hard-Earned Tips

I learned the hard way on a black Commodore: never use 'Rain-X' on the inside of the glass. It fogs up like a sauna and is a nightmare to remove. Keep the repellents for the exterior only. Also, if you live in a high-dust area like the Pilbara, you'll need to clay your glass every 3 months. The red dirt just loves to bed itself in.

Watch Out

Keep repellent products away from your paintwork; some can stain trim or dissolve wax if left to sit. Also, don't use your wipers for at least 4-6 hours after application to let the bonding process finish properly.

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