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Clay removes what chemistry can't. After alkaline, acid and iron stages have dissolved their targets, some contamination remains physically embedded in the clear coat — overspray, industrial fallout, bonded grit your hand can feel as roughness on the panel. Clay bars and synthetic clay shear these particles off mechanically, and the lubricant is not optional: it's the slip layer that lets the clay glide instead of dragging contamination across the paint. Clay when the paint feels rough after washing — not on a schedule.
Where clay fits in the sequence: the 3-pH wash system, decoded.