Originally published at: Experience the theraputic effects of watching filthy street signs get power washed | Boing Boing
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The mere idea of living someplace that’s consistently wet enough to even grow algae and moss on street signs is pretty alien. The only things that obscure street signs around here are graffiti and dust (and usually the graffiti obscures it long before dust can build up).
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I’d think theres a clear coating that has biocidal properties eliminating the need to remove growth. But it probably costs money.
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Pressure washing is one of the most satisfying chores in the world.
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That is feckin mint! Thanks for sharing 
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We just use Wet & Forget.
But we also have a pressure washer for heavier stuff, like on the lawn equipment.
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