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To: blueplum

Lichen happens.

2 posted on 03/01/2019 10:59:49 PM PST by Windflier (Pitchforks and torches ripen on the vine. Left too long, they become black rifles.)

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To: Windflier

This article is idiocy. Lichen is easily killed with sodium hyperchlorite also known as bleach or chlorax.

Just spray the damn things down once a year and do not worry about it. It will not hurt the stone.

4 posted on 03/01/2019 11:11:51 PM PST by cpdiii ( canecutter, deckhand, roughneck, geologist, pilot, pharmacist THE CONSTITUTION IS WORTH DYING FOR)

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