On May 5, 8:00*pm, Boden wrote:
pipedown wrote:
wrote in message
...

Does anybody know how to remove rust stains from asphalt shingles? *I
have to vents that have left rust streaks running all the way down the
roof to the gutters. *I have light gray shingles.

Stop the source of the rust perhaps by painting or replacing the nails (with
copper) and the stains will fade in a year or two. *The rust stain is just
particles trapped on the shingle surface not actual rusting of the shingle
so a rust cleaner like CLR will have limited effect (except by virtue of the
soap it also contains). *Plain old dish soap and a garden hose would be how
I would start. *Don't spray too hard or the grit will come off too much and
you'll wish you had left it alone.

You can remove the rust stains easily with oxalic acid. *But, first you
must eliminte the source of the rust or they will re-occur.- Hide quoted text -

- Show quoted text -

Thanks for the advice. I have already taken care of the rust with
some black rustoleum. Where can I buy some oxalic acid?