My bathtub is cast iron and 62 years old. The previous owner was
elderly and wasn't able to clean very well. It has quite a bit of
calcium, lime, soap scum and rust deposits. From reading this group
and various other sources I know I need to clean it with acid I'm just
not sure which would be better - phophoric or oxalic acid (aka wood
bleach). I know oxalic is poisonous and phosphoric is little easier to
deal with but I want the best results possible. Refinishers do an acid
cleaning before they refinish a tub. Anyone know what they use? I
would appreciate any info you may have regarding acid use for cleaning
a tub with these kinds of stains.
Also, after cleaning does it make any sense to use a polishing
compound to buff out the tub? I'd like to restore whatever luster or
life it has left in it and I don't want to resurface. I was thinking
of a buffing compound such as what is used on cars after they are
newly painted. I believe this has a componenet similar to a very very
fine grit wet/dry sand paper. Aren't tub paints similar to what are
or used to be used on cars?
Any thoughts would be greatly appreciated.
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Thanks very much.