hey guys, bidding a job with Arkansas flagstone pavers with grout a patio, the grout has the black stain, will 4% work good, and fast on this area? It's down the street from my house and the houses around it are real dirty, would be a good target area. NEED PROFESSIONAL ADVICE!!!!!!!!
Thanks, Red C
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Like mike said, a 4% mix should work fine. If you have a booster pump it will really help with the rinse. Also, make sure to have a push broom around, just in case you need to agitate a little, especially the grout.