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Unread 09-03-2020, 05:47 AM   #1
claycarson
Commercial Cleaning and Maintenance
 
Join Date: Apr 2004
Location: Arlington, outside Boston
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Exterior Granite Stained by Leaves...Any Ideas??

We don't work outdoors much cuz we do marble polishing and such. Customer sent me this photo of a new granite patio stained by leaves.

Short of telling him to cut down all trees and post a 24 hour sentry armed with a leaf blower, any practical ideas on avoiding the stains? There's no point in me charging him anything to remove the stains if they're just gonna come back the next day....
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Unread 09-04-2020, 12:49 PM   #2
Tile & Stone Guild
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Was it sealed? Tannins can be tough to prevent and getting them out can be tougher to remove. Try some warm water and oxy clean or similar in a small area. If it wasn"t sealed than repeated wetting will drive it in.

I had a customer refuse to remove a Walnut tree which after a few years ruined a huge set of Indiana limestone treads.

Shame they weren't at least warned of this, I love stone but there aren't too many places I would use it anymore, tile selections are too close to the real thing.
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Unread 09-05-2020, 01:33 PM   #3
claycarson
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I don't believe it was sealed.

I think you're right that it's tannins...my mom had told me they stain all kinds of things, like picnic tables, etc .
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Unread 09-06-2020, 09:15 AM   #4
Davy
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I would start by letting a mild cleaner dwell on the stone for a while and then scrub at it. Then I would power wash it not letting the spray tip get too close. Experiment with it and use a little stronger cleaner if you need to.

Of course the stains will return in time but that's no reason not to periodically clean it.
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