Preventing swils is a big deal in maintaining your cars paintwork. Swirls are created by dirt that comes loose from the paintwork. The Grit Guard prevents the dirt from roaming the water. The Grit Guard will fit perfectly in your Grit Guard Bucket. When you rub your mitt against Grit Guard in the water, the fluffed up fibers allow the Grit Guard to extract the dirt, grit and grime. Once dirt settles in the bottom of the bucket, the Grit Guard keeps it there by separating the wash water into four quadrants, so the water cannot be disturbed.