I have a chimney with stain from an old corroding spark arrestor. (See
picture at www.sandpoint.net/scsi/chimney.htm). I have tried several
cleaning products I can find at the hardware store and used a pressure
washer without luck. Any suggestion?
<< I have a chimney with stain from an old corroding spark arrestor >>
If the stain is rust, many commercial products will attack it. Other corrosion
detritus won't respond as well. The trick is getting rid of stains is to keep
the active material in contact long enough to dissolve the mark. A building
maintainance supply firm will have producxts that might work. Janitorial supply
places are another source.
If nothing seems to work, then a low cost air powered sand blaster wil help.
Body shops use these for spot cleaning small rust areas before repairs. HTH
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