Stage zero: wash, clay, decontaminate — the 60 to 90 minutes before any machine touches the car
Washing alone does not remove bonded contamination. Run your fingertips over a 'clean' bonnet inside a thin plastic bag and you will feel grit — industrial fallout, brake dust and overspray fused to the clear coat, which builds fast anywhere near active construction. The technician removes it chemically (an iron remover that turns purple as it dissolves ferrous particles, plus tar remover on the lower panels) and mechanically, with a clay bar or mitt glided over lubricated paint until the surface feels like glass.
Done properly this stage takes 60–90 minutes, and it is non-negotiable: a quote promising a full polish in two hours flat has compressed or skipped decontamination. The final prep step is taping — rubber trim, textured plastics, badges and panel gaps get masked, because compound stains porous plastic white and a pad edge catching a badge at speed damages both.