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Posted by on November 20, 2006, 10:39 am
If you have access to oxalic acid I would try that.
If you can find some concentrated hydrogen peroxide say 20% or so it
might also work.
Some stains however are forever.
j wrote:
> HI,
>
> I have been working on cleaning my slate floor for a while now. Back a
> month or two ago you guy gave me some cleaning suggestions for cleaning the
> tile. After trying the suggestion along with other things, I finally got
> the coating off the floor. Below if the description of the grout problem if
> any of you have the time or experiance to lend some suggestions. Thank you
> in advance, J
>
> I have good clear photos of the tile floor with the grout that I can e-mail
> to you if it would help.
>
> The grout rapidly asorbs water.
>
> The slate floor was put into the home in 1963. Sometime over the years,
> likely about 20 years ago, someone aplied some type of coating to the floor,
> I believe it was polyurethane. The cloating was partially worn off, and
> looked horriable. After trying to clean the floor with a number of
> commercial strippers, solvents, and manual abrasion I ended up using a
> methyl chloride based stripper to clean the floor. The coating came clean
> with the stripper and a lot of scrubbing. I was left with the grout the way
> it looks in the photos. It is smooth to the touch and does not appear to
> have any of the polyurethane coating still on it.
>
> Now that the polyurethane coating is gone I have tried to clean the grout a
> number of ways. I have used: abrasion with scouring powder, chlorine
> bleach, oxygen bleach, a commercial cleaner that is alkaline based, paint
> thinner, alcohol, detergent, vinigar, and lacquer thinner. I have not tried
> a more acidic (muratic acid based) cleaner, but I am not optimistic it will
> work since everything else has failed to clean it, including the vinigar.
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