Sometimes, people may have trouble when they making foam to wash car.

There are several ways can help with this problem.

Firstly, it is better to wet your car before you spray foam on it. Wet surface can easily mix with the foam.So the foam can stick on the surface and stays longer.

Secondly,the mixing ratio also is the key. Usually, the higher concentration rate will have more foam.

Third,Use hot water to brew car wash liquid.

Lastly, the most important one, you should use the high pressure washer spray gun & foam cannon.

The minimum pressure of the car washing machine should be 130Bar (1885psi), or the foam effect is not good