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Car Washing & Drying intermediate 3 min read

Getting Rid of Nasty Water Spots

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

Water spots are a literal headache, especially after a hot Aussie summer. Here is the no-nonsense checklist to get your paint clear again without ruining your clear coat.

SC
Sarah Chen Interior & Leather Specialist
| Updated: 4 March 2026
Getting Rid of Nasty Water Spots

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, we’ve all been there where you wash the car on a hot arvo and the sun bakes those mineral deposits on before you can even grab a towel. I once spent six hours chasing spots on a black Land Cruiser because the owner used a bore-water hose, never again. This checklist covers how to tackle those marks safely before they etch deep into your paint.

01

The Essential Gear

What You'll Need

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Dedicated Water Spot Remover — Specifically an acidic-based one like Bowden’s Own Agent Orange or Gtechniq W6. Don't bother with vinegar; it's too weak for our sun-baked spots.
Clay Bar or Clay Mitt — To grab any leftover red dust or grit stuck in the pores.
Quality Microfibre Applicators — Grab a 4-pack. You’ll want fresh ones as you move around the car.
Clean Microfibre Towels — High GSM (plush) is better to avoid marring.
Detailing Spray or Lubricant — Crucial for the claying stage.
Isopropyl Alcohol (IPA) Wipe — A 50/50 mix with water to strip the surface and see what you're actually doing.
A Bucket of Fresh Water — For rinsing between sections.
Your Choice of Protection — A good sealant or wax to seal the 'open' pores once you're done.
02

Pre-Start Checklist

What You'll Need

0/4
Is the paint cool to the touch? — If you just drove in from the 40-degree heat, let it sit in the garage for an hour.
Are you in the shade? — Never do this in direct sunlight or the chemicals will dry and cause a bigger mess.
Is the car actually clean? — Give it a proper wash first. If there's salt spray or dust on there, you'll just be sandpapering your paint.
Fingerprint test — Run a finger over the spot. If it feels rough, it's a deposit. If it's smooth, it might already be etched (which means polishing).
03

The Removal Process

Tap each step to mark complete
01

Targeted Application

Apply a small amount of water spot remover to your applicator. Work in a small 40x40cm section. Don't go 'cowboy' and spray the whole bonnet at once.

02

Dwell Time

Let it sit for 30-60 seconds. You want the acid to break down the minerals (calcium/magnesium) without drying out. If it starts drying, add more product immediately.

03

Light Agitation

Gently work the product in circular motions. I've found that 'scrubbing' doesn't help, it's a chemical reaction, so let the product do the heavy lifting.

04

Neutralise and Rinse

Wipe the area with a damp microfibre or rinse with a hose. This stops the chemical reaction so it doesn't eat into your clear coat.

05

The Clay Bar Stage

If the spots are stubborn, use a clay bar with plenty of lube. This pulls out any remaining mineral 'nubs' that the chemical might have missed.

06

IPA Wipe Down

Spray your IPA mix and wipe clean. This removes any oils from the spot remover so you can see if the marks are actually gone.

07

Re-Protect

Since you've just stripped everything off the paint, chuck a layer of sealant or wax on. Personally, I reckon a ceramic sealant is best for coastal areas.

04

Final Inspection

What You'll Need

0/3
Check with a light — Use a torch or your phone light. Look at the paint from an angle to check for 'ghosting' marks.
Check the glass — Water spots love windscreen edges. Make sure you cleared those too or they'll annoy you next time it rains.
Feel the surface — It should be slicker than a greased pig. If it's grabby, you've still got contaminants.

Watch Out

Don't let acidic removers sit on glass for more than a minute; they can actually etch the glass permanently (learned that the expensive way on a mate's Beemer). Also, if the spots don't budge after two hits, stop. You're likely looking at etching that needs a machine polish, and rubbing harder will just ruin the paint.

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