2 THE BUCKET METHOD
("2 bucket method", "2BM")
When you wash the car with only one bucket, you rinse the washing glove together with the cleaning agent and add dirt, loose sand, etc. to the washing glove, etc. After you rinse the glove, it will still be full of particles that end up back on the car.
This can be scratched. If you use only one bucket, it is completely impossible to get a clean washing glove. If you use two washbasins, you get a much cleaner wash glove.
In the first bucket, use only clean water to rinse off the wash glove. After rinsing off the wash glove, turn it upside down and lower it into the other bucket containing the detergent.
Always use a grate at the bottom of the buckets to stop sand and dirt from swirling up. This is also called a grit guard and is definitely a "must have".