Wash your car in style with these new detailing buckets, finished in gloss black with the stylish Auto Finesse® logo printed on the front and now including a teal grit guard. The Detailers bucket can hold 20 litres and an essential when car cleaning. Just remember, you'll need two.. Fill one bucket with fresh water – this is your rinsing bucket. Fill a second bucket about 3/4 full with water then add Lather car shampoo and stir. Add enough car shampoo to make the mixture feel slick to the touch. Then top up the bucket until full. Start at the top of the car and work your way down.