You need to etch the concrete. Use hydrochloric acid or muratic acid
and wash it down. You can usually find directions on how to do an acid
wash if you look for directions on how to prep concrete for painting.
Warning: Be prepared to do the whole thing. Test a small area first and
see how it blends in. The area that is acid washed will be nice and
white.

Good Luck

Steve



wrote:
Anybody with experience in cleaning stains from rotting leaves left on
the fiber reinforced driveway?

I tried 1800 PSI power wash - did not help.
I tried steel brush with soap - did not work.

What would be the best way to remove them ?

Pszemol.