It's like anti graffiti, can't touch you for cleaning something.
Once had a neighbour that used bleach to write "NO PARKING" on the pavement outside his house.
You can also paint with moss but blitzing it in a blender with egg white.
The moss will continue to grow after you paint it on a wall.
(
Cerebus Sticky! Sticky! Stick! Stick!, Wed 10 Jan 2018, 9:50,
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My mate Moose pioneered this
https://www.theguardian.com/uk/2004/oct/15/ukcrime.prisonsandprobation
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shitkicker, Wed 10 Jan 2018, 13:39,
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