Just a quick check to get some feedback on my process. I’ve got a job to clean an amphitheater at a school. It’s not huge but it’s pretty dirty. The construction is natural stone blocks.
Hit a small section with regular HW mix. Let it dwell 5 minutes.
Hit it again with regular HW mix dwell for 10.
Hit it a final time with the same let it dwell for 15 then rinse. Keep it wet between each application.
I think I will know if this is going to be effective at the second application. Assuming it’s not move to a 3% SH solution at the same dwell times. Increase strength as needed.
Hopefully I can be active applying pre wash or on the surface cleaner while I wait this out.
We do alot of limestone in my area… Simply mist the stone, don’t soak, then we apply a 50/50 mix per section, dwell time maybe 5 mins, rinse till it runs clear and reapply where needed. Always rinsing between applying mix. Don’t use a turbo nozzle with limestone, unless you want to pick up chunks of stone.
