Clay bar

A clay bar is a soft, pliable synthetic clay that you knead into a flat pad and glide over wet, lubricated paint. Unlike washing, which removes loose surface dirt, clay physically pulls out contaminants that are bonded into the clear coat, such as tree sap, overspray, industrial fallout and tar specks that chemicals alone cannot fully lift.

You can feel the difference clay makes by running a hand over freshly washed paint before and after claying, since bonded contamination leaves a rough, gritty texture that washing never removes. Claying before polishing or applying a coating matters because any leftover contamination gets trapped underneath and can interfere with how well a sealant or coating bonds to the surface.

Clay always needs a dedicated lubricant spray, never plain water, to prevent it from marring the paint as it drags across contamination. Fold the clay regularly to expose a clean surface and inspect it often, since a dropped clay bar or one packed with grit will scratch paint instead of cleaning it. A common mistake is claying paint that has not been washed first, which just grinds loose surface dirt straight into the finish.