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.
Thanks for any help or suggestions.