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Getting a Spot Free Rinse for your Car Wash Business

The final rinse may seem like a small and easy step in a car wash - maybe the simplest of the entire car wash process! Many outside of the industry assume you can do this step effectively with an ordinary garden hose, but while that method works for car washing at home, it can leave water spots and and defeat the purpose of the car wash.  At a professional car washing facility, the spot-causing minerals that a poor rinse can leave on a car can negatively impact the entire wash process taken just before.

That is why you should ditch your garden hose and look to implement improved water quality and a spot free rinse to your car wash business, so you can make every car shiny, and - you guessed it - spot free.

Shiny vintage car


Customers Desire a Spot Free Vehicle

The main benefit of a Spot Free Final Rinse that it helps to reduce the number of water spots on your customers' cars. Water spots are caused by minerals in the water, and not only can they be difficult to remove for future washes but they ruin the rest of your car wash job, leaving unsatisfactory results. By using a spot free rinse, you can better ensure that you will produce the cleanest and shiniest cars around.

So unless you want to give every car you wash a window cleaning immediately after leaving your wash, you will want to consider implementing a spot free rinse to your car wash.

What do we mean by 'Spot Free Rinse'?

This rinse is a final step in your car wash process (before drying) that helps remove any residual soap or cleaners from the surface of the vehicle by spraying it with an arch rinse application, pressure washer gun, or similar format. Often rinsing applications use water, usually softened, that carries minerals and contaminants within it, but the final rinse should be different!

Spot free rinsing generally uses water that has been softened plus processed through a reverse osmosis system (or another type of system) to remove dissolved containments before the water flows over a vehicle.

Water droplets

What are Total Dissolved Solids?

Total Dissolved Solids (TDS) are the contaminants and particles within water.  Unless a region's water source is naturally very pure, typically a car wash needs to replace regular tap water with softened water for washing and even purer spot free water for the final rinse, to offer a spot free car wash. In fact, 85% of regions in North America have hard water, because water travels in the ground and picks up minerals like calcium, magnesium, and to a lesser extent, iron. These elements are dissolved in water, and make it "hard". This is measured in Grains Per Million, or Total Dissolved Solids in Parts Per Million. Ideal water is zero to 3 GPG or about 0-55 PPM.

If you use water that contains high TDS (like tap water), especially in the last rinse on a vehicle, you will likely leave those minerals like calcium and magnesium on the surface of the vehicle, which will dry and become the unattractive water spots we all know.

So it is important for your car wash business to process your water. The spot-free rinse will leave customers happy with their car wash results, and having softened water will also keep your chemical costs down, and equipment free from excessive mineral buildup.

How to test your water for Total Dissolved Solids? A TDS Meter

You can purchase a TDS meter, which is an instrument used to measure the total dissolved solid content in a liquid. You can then use this meter on a sample of your car wash's water to see the TDS level and how contaminated it actually is.

Can hard water affect my car wash?

If your final rinse is using hard water, then it's likely that the rest of your car wash will be using it too. Hard water can impact a car wash in two of its biggest areas, chemistry, and equipment.

Car Wash Chemicals

Hard water can damage the effectiveness of your car wash chemistry. Those contaminants within the water can cause your car wash chemicals to be drawn to the particles in the water itself as well as on the dirty vehicle, and they therefore become less effective. This will lead to a subpar wash for your customers and waste those chemicals your business is paying for.

Car Wash Equipment

Hard water can also be damaging to your car wash equipment. Over time, the minerals will build up and clog your nozzles, outlet hose and pumps, leading to a decrease in performance and an increase in repairs. This can lead to more frequent down time for your car wash and even machines breaking faster.  It can also disrupt water flow and pressure, both of which are crucial for a quality car wash.

Is Softened Water Enough?

While softened water can really improve car wash operations, addressing the problems mentioned above, it can still leave spots as it does not achieve the same spot free water due to dissolved sodium. To truly reduce TDS, and achieve a spot free car, an RO (or alternative DI System in some scenarios) should be harnessed on top of a water softener.  

What does a RO System do?

RO stands for Reverse Osmosis: A process that drastically reduces the TDS in water, to nearly zero, by forcing water through a membrane system to capture particles. This now pure water, especially when used to rinse, leaves a spot free finish as all the solids that cause spotting on the cars have been removed.

Can I just use an RO System with Hard Water?

Softened water is imperative when running RO units as hard water will clog the membranes very quickly, and they are expensive to replace.

What is DI Water?

DI Water or deionized Water is water that has had all of the TDS removed from it. This leaves you with pure H20 that does not contain any minerals.

Why use a Spot Free Rinse System?

Spot free rinses can help your car wash tremendously, mainly by leaving your customer's vehicles free from water spots.

Using water from the RO system in your final rinse will give you that spot free water you can't achieve from a regular hose. This will offer final rinsing results that will be noticed and appreciated by your customers.

Spot Free Rinse Products

If you are interested in using a spot free rinse for your car wash, the most popular spot free rinse systems are Softened Water Systems for the whole wash's water and chemical applications, paired with RO Systems for the final rinsing.

Water Softener Systems

A softened water system that can be used for your spot-free rinse, and your entire wash. This system will remove the minerals from the water but it can also add other neutralizing particles, like sodium, to the water.

Reverse Osmosis Systems

A RO system is a great option for your spot free rinse. It is our recommended option to remove TDS out of your water, making it perfect to use for a wash's final rinse application, resulting in shiny, spotless vehicles.

Shiny car


So, is a Spot Free Rinsing System Worth It?

We absolutely believe implementing a spot free rinse into your car wash is worth it. There may be a substantial initial cost at first adding the water processing equipment, but the difference you will see in your results and subsequently, sales, will make it all worth it in the end.

Whether you have a touch-free unit or a friction tunnel, water is the most important element to a car wash, and you will want to ensure you're doing everything you can to use it to its maximum effect.

Don't Stop There, Recycle your Water with Clear Technologies!

Not only should you be purifying the water at your car wash, but you should also consider recycling the water you use. Recycling your water is not only good for the environment but it's also great for your bottom line, as you need to pay for every drop of water that your car wash uses - you may as well make the most of it! You can do this with a Water Reclaim System.

These systems use a variety of odor controlling and filtration systems, like needing resin beds that will need to be replaced on a regular basis (It would be wise to follow the manufacturer's directions and even purchase bulk resin), while others will use cartridge filters that will need to be replaced less often.

If you want a powerful, easy maintenance solution, we recommend a water reclaim system like the ClearWash PR series, which is one of the best options on the market, with automated backwashing and ozone odor control. It will take the dirty and used water, clean it, and then let your car wash use it again and again to wash more cars. This way you save on water usage which will save your business a lot of money in the long run. Just think of how many gallons of water you use to wash a single vehicle!

You can learn more about ClearTech and their products here.

Turtle Wax Pro Titanium TX4


Seeking advice on getting shiny, spotless cars? Let Turtle Wax Pro help!

With over 75 years in the car care industry, we understand the significance of water quality in any car wash operation, and we know the importance of getting those spot free results!

If you're finding yourself wanting to achieve a spot free car wash, feel free to contact us, we are always happy to chat with those looking to improve their wash quality!

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