On Oct 18, 2:20*pm, "Steven L." wrote:
I'm a do-it-yourself newbie who's trying to clean the stained grout
(used to be white) between the tiles over the bathtub in my bathroom.

The stains appear to be a combination of soap scum and rust stain.

To get any whitening agent to the grout you first have to penetrate
the soap scum, chemically and/or abrasively. I had pretty good luck
with TileX, but that was decades ago and it probably isn't worth ****
today.
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- gpsman