I have a hand-held buffer that my wife fancies. She would like to use
it to clean very dirty shower/bath tiles. I think my buffer is not
powerful enough for what she needs and may turn a bit too slow.

At any rate, I'm looking for suggestings for something she can use. We
once used a grinder with a buffing pad and some Barkeeper's Friend to
clean a very scummy shower (walls and bottom) in less than an hour. It
would have taken several hours by hand.

Something held-held and wireless would be best. Suggestions?

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