When investing time into restoration of an auto, as we’ve previously noted, the windows and glass on your car can make a big difference. Even after finding what works best for you on the windows, you can still be left with water spots. In this article we’ll delve into water spots, what causes them, and how to remove them.


Water spots are caused by the mineral deposits left behind as water droplets dry on your glass. Calcium, sodium, and other alkaline minerals will leave white, chalky stains on glass, plastic,  and metal. They are unsightly initially, but do the real damage in the long run.

If left untreated long enough, the mineral deposit will etch or permanently stain the glass causing ugly, embedded, discolorations in the window.

The good news- there are products out there that can be used to remove the water spots, provided they have not been absorbed too deep into the glass. Every situation is different, and you don’t know until you try. As always, this process starts with a thorough car wash.

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Chemical Guys Spot Remover


You have a few options to choose from, easily searchable online, but the one we have found to work the best is from Chemical Guys- WATER SPOT RX HARD WATER SPOT REMOVER FOR GLASS AND WINDOWS. Easy to apply, and you can either hand polish it on, or use a machine polisher.

Another reason why we like this product- it not only removes water spots, but helps to prevent them in the future similar to Rain-X.

While we're on the topic of prevention, if possible, always clean your car with de-ionized water. While we understand most homeowners don't have immediate access to de-ionized water- if your calling a professional auto detailer to your house, ask them about it. Some may have it. When a car is rinsed with de-ionized water, rather than needing to be dried off, the water doesn't leave stains when it dries.

If you’re not able to get your hands on de-ionized water and detailing your own auto, try to stick with these tips-

  1. Be mindful of your water source. Try not to use “hard” water. If you’re getting water from a private well, make sure it is coming through the water filtration system at the residence. City water is usually treated already.

  2. When you’re done washing and rinsing, quickly dry the vehicle, starting with the windows, roof, and all shiny surfaces. Then the hood followed by all vertical sides of the vehicle. If you dry the auto in that order, you’ll risk the least amount of water evaporation and mineral deposits.