The bonded-contamination test
After you wash your car, slide a hand in a thin plastic bag over the hood. If it feels like fine sandpaper instead of glass, that roughness is embedded contamination — rail dust, brake dust, industrial fallout, and mineral deposits sitting in the clear coat. No soap removes it.
We remove it mechanically with a clay towel and lubricant, panel by panel. This is what makes the difference between paint that looks acceptable and paint that looks wet. It also matters functionally: a sealant applied over contamination bonds to the contamination, not the paint, and fails early.