you can use a concrete etcher/cleaner like found at lowes. I think they have
the cleaner alone or the etcher/cleaner like you use before you put down
concrete paint. either works well on bare concrete. there are also other
cleaners commercially avail but I have no experience with these. the
etcher/cleaner I used in the garage before I painted the floor worked
extremely well, got up the oil dripped from I assume contractors vehicles
and the paint is holding well on top of that. I used the H&C products as
that was the paint we selected and figured we would stick with the same
manufacturer throughout the project.
Muriatic acid is just a weak solution of hydrochloric acid and shouldn't
hurt vegetation. Another thing you might try is tri-sodium phosphate also
available at Home Depot/Lowes... usually labeled as TSP. The brown stain in
leaves is caused by tannic acid so if the above do not work you might google
tannic acid to see what can clean it. It can be a dickens to get off....
hmmm... now that I think of it, bleach may be effective also.
I've found that the leaf stains disappear in a couple of months if you get
the leaves off. The Maple seeds stain my driveway the worst, but it all
fades away fairly quickly. It's the battery acid stains that just won't go
away on my drive. Muratic acid just made the concrete surface rougher,
didn't phase the stain.
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