Decontamination is the process of removing contamination that has bonded to or embedded in the paint surface, contamination that a standard wash cannot remove.
There are two primary contamination classes. Chemical contamination includes iron particles from brake dust, rail operations, and industrial fallout; these embed in the clear coat surface texture and oxidize on moisture contact. Organic contamination includes conifer sap, tree tannins, road tar, and industrial film. Both require specific chemical treatment (iron fallout removers that dissolve ferrous compounds, clay bar treatment to lift surface-bonded organic material) before any polish, sealant, or coating can perform correctly.
Skipping decontamination before a detail or coating means applying a protective product over a surface that is already contaminated. The protection sits on top of the contamination. Jesse decontaminates every vehicle before any additional treatment. It is not optional.