The Nano Clay Sponge fine grade system works fast and achieves professional results with the new advanced rubber polymer technology. Replacing the use of the traditional clay bar it safely removes paint overspray, water spots, and other boned surface contaminants from the surface automotive paint, glass, moldings and plastic. Unlike clay bars the Nano Skin can be washed off by imply rinsing with water. Always use the Nano Clay Sponge with lubricants and keep surface cool. Fine Grade is good for dark cars and newer cars with less or light contamination. Always keep lubricated.