Good afternoon.

There was a product by Prosoco called Bio Wash.  It is safe for killing biological growth and doesn't require any other steps.  It also leaves a type of retardant behind which prevents the biological growth from reappearing so quickly.

Joyce Harris

Personal Touch Service Solutions

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From: sccpartners@stoneandtilepros.simplelists.com <sccpartners@stoneandtilepros.simplelists.com> on behalf of marbleplus <marbleplus@comcast.net>
Sent: Monday, April 8, 2019 3:33:11 PM
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Subject: Patio

 

Treated this with 50/50 bleach mixture. Does anyone know of something that will take the black out besides acid?

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