Photograph and report before touching it
The photograph takes ten seconds and it serves several purposes. It records the incident for the client's own reporting, whether that is to police, an insurer or a landlord. It lets the supervisor assess the surface and the medium before anyone attempts removal. And it establishes when the damage appeared, which matters where a building is shared or where a pattern of incidents is developing. Ten seconds of photography preserves options that cleaning removes permanently.
Reporting before removal also protects the client's options. Some incidents are worth reporting to police, and cleaning first removes the ability to do that meaningfully. Others involve content that the client will want to know about even after it is gone. The decision belongs to them, and it can only be made if they are told before the surface is cleaned rather than afterwards. Once the surface is cleaned, the choice has been made on the client's behalf.
