Oxalic acid is used to remove stains in woods high in tannins and if
the stains are from tannins, ... Wood Bleach is oxalic acid and not
expensive, try paint store. Check the ingredients to ensure it is
oxalic. Barkeepers Friend also contains oxalic but may have other
ingredients also. Don't breath the oxalic dust.

On Sun, 31 Dec 2006 17:04:15 GMT, Norminn
wrote:

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.

Seems an organic stain should come off with bleach. Tried that?