
We live in costal Texas, mold is a big problem here, and flagstone is porous - would prefer to not use chemicals that would harm the lawn when they run off.. but think power washing may ruin the flagstone, which seems to flake easily.
Also, any way to seal the flagstone after cleaning?
March 7, 2010
How do you clean mold stained flagstone (patio)?
What is the best way to clean a flagstone patio that has darkened and has some mildew issues?

I need to make sure the cleaning doesn't harm the surrounding grass in the process.
