Posted 6/6/2020 06:07 (#8300671 - in reply to #8300365) Subject: RE: Dirty/mouldy concrete tank
Illinois
Muratic acid sprayed with a garden sprayer and pressure washer
Just like cleaning a sidewalk
Bob Vila says to use 1:10 solution for ten minutes
Then neutralize acid with 1:16 ammonia
Best to research and use personal protection
Always pour acid into water to avoid a violent reaction