We cleaned these vacuum islands a couple weeks ago. Used turbo nozzle with hot water to clean them. We got a lot of crap off of them, but owners were hoping to have then look a lot brighter. I’m not sure if it’s just the block and that’s what it’s going to be. We tried bleaching one and it didn’t make much difference. Didn’t know if there was anything out there that would make a difference?
Some sort of Masonry cleaner should do it. Do you know theyre made of
What was your the mix % with the SH, and how was it applied?
3-4% mix, let dwell 10min - hit with med pressure they;ll look like new. Do those things at least weekly.
On real dirty brick I don’t waste any time, hit with at least 6% mix