how to clean lichen on brownstone

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

lola

in Exteriors 6 years and 8 months ago

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RobertGMarvin

in Exteriors 6 years and 8 months ago

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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.

lola | 6 years and 8 months ago

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

dorkofwindsor | 6 years and 8 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.

Guest User | 6 years and 8 months ago

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

Arkady | 6 years and 8 months ago

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