A test patch can prevent damage—or create a bright halo, ghost marks or permanent chemical etching if it’s in the wrong place or judged before it dries. Mark Cave explains how to choose a discreet test area, work cautiously, document the result and get the customer’s written approval before treating the full surface.

For structured, self-paced learning in surface identification, chemical selection, testing and safety, explore the CPD Certified Softwash Training Course and resources at SoftWash UK.

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