Car washing at home (with RO-water)

When cleaning the car there are some important steps to follow, rinse, soap, rinse, protect and dry. For this, you need a pressure washer. A Greenwork 40V battery driven pressure washer is perfect when you don’t have access to an electrical outlet where you can clean your car. We only got access to a garden hose in the parking lot. The benefits of the pressure washer with a tank or suction tube are that I can use RO-water (Reverse osmosis) as the water source. Another good alternative to battery-driven pressure washers is the Ryobi Cordless Power Washer if you are into the Ryobi platform or the top-rated WORX Cordless Hydroshot Portable Pressure Cleaner.

The key benefits of using RO-water or deionized water is that it has no minerals that can leave watermarks/spots on the paint job when drying. Using normal water for the last rinse or in hot and sunny weather might leave mineral spots and participation on the finish if not dried properly. That’s the reason for the recommendation to not cleaning your car in direct sunlight or hot weather.

RO-water has simply had the dissolved solids removed, similar to, but not as completely as distilled or deionized. Whereas distilled or deionized water will have essentially all dissolved solids removed, RO-water is in the 90% – 95% range for dissolved solids removal.

Ryobi pressure washer

The Greenwork has more than 3 times the pressure when comparing with Ryobi or Worx, 70bars vs ~24bar. This can be compared with the standard pressure in the garden hose at ~6bars.

RO-water do not damage your car or paintjob.

RO-water doesn’t damage either your car or paint job because of the protective coating applied. Water that is produced via reverse osmosis tends to be aggressive because of its high purity and lower levels of dissolved substances. The lower the water’s level of dissolved substances, the more aggressive the water is.

Car Wash, Car Shampoo, Shampoo, Car Cleaning

How to clean your car with RO-water

Rinse the car with water from top to bottom to remove any loose dirt and debris. Attach a foam cannon with some Hybrid Solutions Ceramic Wash & Wax or your foam detergent for your car and spray it down.

Let the foam sit for a couple of minutes to work on the dirt and grime before rinsing it off.

How to rinse your car with RO-water

The best way is to add a protective no-rinse solution to your final rinse of the car. This will help with the composition of the water and at the same add a protective coating to your car when dry. Because of the use of RO-water, there is no need to dry the car afterwards, there will be no water spots. This will save you a lot of time and remove the risk of scratching the car’s paint.

Add a small amount of Hybrid Solutions Ceramic Wet Wax to the last rinse water and rinse the car.

Do commercial car washes use RO-water

The top-end commercial car washes use RO-water for the last rinse of the car. This is done to remove the risk of having water spots on the finished surface when the water has dried. Contactless car washes use air to dry the car witch might results in some spots not being completely dried. When the last rinse solution is RO-water these spots will not result in any watermarks because there are no minerals that can form.

commercial car wash

Disclosure: Some of the links above are affiliate links. This means that, at zero cost to you, I will earn an affiliate commission if you click through the link and finalize a purchase.