Contamination comes in two types. Loose contamination — dust, dirt, road film — rinses and washes off. Bonded contamination — iron fallout from brakes and construction, tar from fresh asphalt, mineral deposits, industrial fallout — is chemically or physically stuck to the clear coat. No amount of shampoo removes it; it needs dedicated chemistry and mechanical action.
Exterior detailing attacks both in sequence. A citrus pre-wash and foam loosen the loose stuff before a mitt ever touches paint (this alone prevents most wash swirls). Iron remover dissolves embedded iron particles — you’ll see them bleed purple as they dissolve. Tar remover lifts tar spots. Then a clay bar glides over lubricated paint, shearing off anything still bonded.
Only now is the paint genuinely clean — often for the first time in months. The finish is a wax or paint sealant: carnauba for warm glow (8–12 weeks in Dubai), synthetic sealant for durability (4–6 months). Wheels, tyres, glass and trim are finished to match.