The Rollright Stones forum 40 room
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Since it's happened before elsewhere, and sadly may happen again, it would be good if there was a known procedure for dealing with it. Judging by discussions on Britarch there are various possible techniques.

But in particular, and without claiming any technical knowledge, I can't help thinking that if this was found very quickly whilst it was still wet then very low pressure hosing down by the fire brigade might have removed the lot without affecting the lichen. Just depends on the particular type of gloss paint involved.

Don't know if that's right, but EH ought to develop an action plan for such things in conjunction with paint manufacturers.

An action Plan -
1. find the feckers
2. prod them with sticks
3. repeat 2 till you get bored

It may be a little difficult to come up with a plan as it must depend on the type of paint used, unless they left the tin behind you would have to work that out first.
Getting the stuff of could be by Heat, chemicals, high pressure jetting or scraping - none if them sound like they would do the stones much good. Good luck to whoever has to deal with this.