CARMATE Car Washing Shampoo. How To Use :- Add 10 ml of Car Wash Shampoo to 1 liter of water in a clean bucket/foam gun. Rinse the vehicle thoroughly to remove any grit that could scratch the paint surface. Apply the diluted solution onto a vehicle by wash the mitt/sponge or foam gun. Scrub and wash using an appropriate brush and sponge if required. Rinse thoroughly and dry using a clean, soft, Microfiber Cloth or chamois.