how to clean lichen on brownstone

Vinegar is probably OK for brownstone, but I wouldn’t want to use any acid on limestone. [White vinegar is 5% acetic acid]. I’ve had good results with a 1:5 mix of bleach and water on my limestone.

RobertGMarvin

in Exteriors 7 years and 4 months ago

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lola | 7 years and 4 months ago

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brownstone renovation several years ago, facade looks great but the steps and surrounding stone are covered in lichen. How to clean it?

Arkady | 7 years and 4 months ago

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Wash it down w/ a mild solution of bleach & water.

Guest User | 7 years and 4 months ago

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or use D2 for something a bit less caustic. http://d2bio.com/

dorkofwindsor | 7 years and 4 months ago

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white vinegar much more eco friendly. Costco sells massive bottles for cheap. Dilute 50/50, spray it on with a 1 gal Sprayer ($9) from HD, and leave it. Repeat until gone.

lola | 7 years and 4 months ago

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thank you, I’ll try vinegar. Has anyone tried Spray and Forget? or similar