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Car Washing & Drying beginner 8 min read

Clear Vision: How to Deep Clean and Rain-Proof Your Windscreen

Most car owners make this harder than it needs to be. Here's the straightforward approach that actually works—no fluff, no upselling.

Struggling to see through the glare or sick of your wipers skipping across the glass? I'll show you how to properly strip back the road grime and apply a repellent that actually works against Aussie storms.

SC
Sarah Chen Interior & Leather Specialist
| Updated: 3 March 2026
What You'll Learn
Clear Vision: How to Deep Clean and Rain-Proof Your Windscreen

Aussie Conditions

Australian conditions are tougher than most—intense UV, red dust, coastal salt, and 40°C summers. European car care advice often doesn't cut it here.
Quick Summary

Look, most people reckon a quick squirt of the washers at the servo is enough to clean a windscreen. Truth is, between the salt air on the coast and the red dust out west, our glass takes a beating that standard cleaners can't touch. This guide covers how to deep clean your glass and apply a proper water repellent so you can actually see where you're going when the heavens open. Whether you're prepping for a road trip or just sick of the 'missus' complaining about the streaks, I've got you covered.

01

Why Your Windscreen Needs More Than a Scrub

I've been detailing for over 15 years now, and if there's one thing that drives me mental, it's a 'greasy' windscreen. You know the one, you turn the wipers on during a light drizzle and it just smears this hazy film across the glass, making it impossible to see. I learned this the hard way years ago on a black Commodore I was prepping for a show. I thought I'd cleaned it, but as soon as the sun hit it at that low afternoon angle, every single wipe mark showed up. In Australia, our glass deals with some serious rubbish. We've got sap from gum trees that sets like concrete, bat droppings that are acidic enough to etch into the surface, and that fine red dust that gets into the microscopic pores of the glass. A good water repellent doesn't just make the rain bead off at 60km/h; it actually creates a barrier that stops all that other junk from sticking. It makes your car safer and way easier to wash. To be honest, once you've had a properly coated windscreen, you'll never go back to 'naked' glass again.
02

The Gear You'll Need

What You'll Need

0/8
Quality Glass Cleaner — Something ammonia-free like Bowden's Own Naked Glass or Stoner Invisible Glass.
Clay Bar or Clay Mitt — Essential for pulling out the embedded grit you can't see.
Glass Polish (Cerium Oxide based) — Autoglym Glass Polish is my go-to for stripping old waxes and oils.
Microfibre Applicator Pads — Get a few clean ones, don't use the ones you used on the tyres!
Waffle Weave Microfibre Towels — These are the best for a streak-free finish on glass.
Isopropyl Alcohol (IPA) Wipe — A 50/50 mix with water to chemically strip the surface.
Water Repellent/Coating — I reckon Gtechniq G1 is the king for durability, but Rain-X works if you're on a budget.
Fine Grade Steel Wool (0000 grade) — Optional, but brilliant for stubborn water spots. Must be 0000 grade!

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03

The Prep Work

Tap each step to mark complete
01

The Initial Wash

Give the whole car a wash first. There's no point cleaning the glass if you're going to knock dust off the roof back onto it. Make sure the glass is cool to the touch, don't do this in the direct midday sun or the products will just bake on.

02

Clay the Surface

Use plenty of lubricant (even soapy water works) and run your clay bar over the glass. You'll hear it 'singing' at first, then it'll go silent. That's when you know you've removed the tree sap and industrial fallout.

03

Dry and Inspect

Dry the glass thoroughly. Run your hand over it, it should feel smooth as silk. If it feels 'grabby' or gritty, hit it with the clay again.

04

The Deep Clean and Application

Tap each step to mark complete
01

Deep Polish

Apply a small amount of glass polish to an applicator pad. Work it into the glass in circular motions with a bit of elbow grease. This is the secret sauce, it removes the traffic film that detergents can't touch.

02

The Steel Wool Trick

If you've got stubborn water spots from the bore water out bush, use that 0000 steel wool (dry) and gently buff the glass. It sounds scary, but it won't scratch if you use the right grade. I've saved hundreds of windscreens this way.

03

Buff Off the Polish

Use a clean microfibre to buff away the polish residue. You'll see the glass start to look incredibly clear now.

04

The Chemical Strip

This is the step most people skip, and it's why their coatings fail. Spray your IPA mix onto a towel and wipe the glass. This removes any oils from the polish so the repellent can actually bond to the glass.

05

Apply the Repellent

Apply your chosen repellent to a fresh applicator. If using Gtechniq or a ceramic, work in small sections. If using Rain-X, apply in overlapping circles. Don't go too thick, a little goes a long way.

06

Let it Haize

Wait for the product to flash or haze over. Usually takes 5-10 minutes depending on the humidity. If it's a stinking hot day in Perth or Brisbane, it'll happen faster.

07

The Buff Off

Use a clean, short-pile microfibre to buff off the haze. It'll be a bit grabby at first, then it'll suddenly glide. If you're struggling with smears, a tiny mist of water on your towel will help clear it.

08

Second Coat (Optional)

For the front windscreen, I always chuck a second coat on after 15 minutes. It ensures total coverage. Don't bother with the side windows, one coat is plenty there.

09

Clean the Wiper Blades

Don't forget this! Wipe your wiper blades with some glass cleaner. If they're old and perished, just toss 'em and get new ones. No point putting a fresh coating on and then dragging old, dirty rubber over it.

10

The Cure Time

Leave the car in the garage or under the carport for at least a few hours. Most coatings need time to bond before they get wet. If it rains 10 minutes after you finish, you've basically wasted your afternoon.

Watch Out

Make sure your glass cleaner is ammonia-free, especially if you have aftermarket window tint on the inside. Ammonia will eat through tint and turn it purple and bubbly over time. (I've seen it happen on a mate's Hilux and it's a nightmare to fix).

The 'Sun Check'

The best time to check your work isn't in the garage. Pull the car out into the direct sun and look at the glass from a sharp angle. This will reveal any 'high spots' or smears you missed. If you find a stubborn smear, just a tiny bit more repellent on a towel will usually melt it away.

Watch Out

Once you've coated your glass, stop using those cheap, bright blue 'washer additives' from the servo. They're often too harsh and will actually strip your expensive coating off faster. Just use straight water or a dedicated 'coating-safe' concentrate.
05

Keeping it Working

Right, so you've done the hard yakka. To make this last, you've gotta be smart about how you wash the car. Most of these coatings should last 6-12 months, but if you're living in a coastal area with salt spray, or you're constantly scrubbing off bug guts after a night drive, it might wear down sooner. When you notice the water isn't 'jumping' off the glass as fast as it used to, you don't necessarily need to do the whole process again. Usually, a good clean with a dedicated glass cleaner will revive it. Sometimes road film just sits on top of the coating and masks the effect. Give it a good wipe and it'll usually come back to life. Also, try to avoid using the wipers when the glass is bone dry and covered in dust, that's like sandpaper for your coating (and your glass!). Give it a quick spray with the washers first to lubricate everything.
06

Common Questions

Can I use this on my side mirrors?
You can, but honestly, I wouldn't bother with the heavy-duty stuff. Rain-X is fine for mirrors. The problem is that without wind hitting the mirror to push the beads off, the water just sits there in little balls which can actually make it harder to see. Stick to the glass that gets direct wind.
My wipers are 'chattering' after applying the treatment, what do I do?
This happens sometimes if the glass wasn't cleaned properly or the coating is too thick. A customer once brought in a Ranger with this issue. The fix? Clean the wiper blades with IPA and give the windscreen a quick wipe with a damp microfibre. If it persists, you might need to lightly polish the glass again to level it out.
Will this stop my windscreen from fogging up on the inside?
Nah, this is an exterior treatment. For the inside, you want a dedicated anti-fog product. But pro tip: most 'fog' is just a build-up of off-gassing from the plastic dashboard (that 'new car smell'). A good clean with a glass cleaner and a fresh microfibre usually fixes 90% of fogging issues.
Can I apply this to a brand new car?
Absolutely. In fact, you should. Dealers rarely prep glass properly. Just make sure you still do the polish and IPA wipe steps, as new cars often have shipping wax or suction cup marks from the factory still on the glass.

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