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Blue,
green or other unusual colored stains, can be caused in
old, badly worn bathtubs and sinks, from cleansers not
rinsed off thoroughly. When harsh abrasives (such as most
scouring powders) are used regularly on these porcelain
enamel surfaces, over several years they wear down the
smooth surface, leaving it rough. Dyes used to
encapsulate the cleaning particles in scouring powders or
other colored cleansers can get into the crevices of such
worn surfaces, and if not rinsed off, and allowed to stay
and harden for days, can be almost impossible to remove.
A strong chlorine bleach solution may lighten the stain,
but will also further dull or discolor the porcelain
surface. So one may have to live with the stain.
This
article was written by Anne Field, Extension Specialist,
Emeritus, with references from the Porcelain Enamel
Institute.
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