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Posted by powersdov on May 5, 2008, 11:46 pm
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> pipedown wrote:
> >>Does anybody know how to remove rust stains from asphalt shingles? =A0I
> >>have to vents that have left rust streaks running all the way down the
> >>roof to the gutters. =A0I have light gray shingles.
> > Stop the source of the rust perhaps by painting or replacing the nails (=
with
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> > copper) and the stains will fade in a year or two. =A0The rust stain is =
just
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> > particles trapped on the shingle surface not actual rusting of the shing=
> > so a rust cleaner like CLR will have limited effect (except by virtue of=
the
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> > soap it also contains). =A0Plain old dish soap and a garden hose would b=
e how
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> > I would start. =A0Don't spray too hard or the grit will come off too muc=
h and
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> > you'll wish you had left it alone.
> You can remove the rust stains easily with oxalic acid. =A0But, first you
> must eliminte the source of the rust or they will re-occur.- Hide quoted t=
ext -
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> - 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?
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> have to vents that have left rust streaks running all the way down the
> roof to the gutters. =A0I have light gray shingles.