I'm looking to clean/power wash the concrete around my in-ground. I've looked at Wet and Forget and they say it doesn't effect pH and safe for around pools. The only drawback is the time it takes for it to work. I'm looking for something a bit more immediate. I have a scrubber attachment for my power washer and I'm looking for a cleaner that won't effect my water chemistry too much. Options that I'm aware of are Krud Kutter, Simple Green, bleach and water, dish soap and water, Zep. I know some of the cleaner will make its way into the pool and I don't want to overly effect pH, alkalinity, phosphates, etc. Deck is stamped concrete, 10 years old, in good condition, just dirty. Any suggestions/recommendations? Thanks.