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I would try the usual spray on oven cleaner -- NaOH
is pretty good solvent for grime.
Try it on a small area first to make sure it does
no damage to the tile or the grout.
"Keith" <nospam@nospam.com> wrote in message
news:Xns976F696DEC053KeithBC4ReaderTokenI@207.115.17.102...
> I was just about to give up and replace the tile (and I had already
bought
> an aftermarket enamel paint kit on the tub) when I accidently found out
> that whatever the "TSP" stuff is nowadays (without phosphate) seemed to
> help- just a little.
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Re: 20 years of grime on tile & grout
