On Mar 29, 10:57*pm, "RJ" wrote:

But more annoying is the grout lines;
It seems they collect every bit of dirt and grime,
and cleaning them is a bitch.

Sounds like they could have been washed-out a tad too deep.

Surely, there must be some sort of ( water based ) product
that'll seal up and waterproof the grout lines... *

Well, there's grout sealer. I don't know if any are water based, but
I imagine in this day and age they all are.
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- gpsman