On Fri, 25 Apr 2014 16:07:25 +0000 (UTC), "Danny D."
wrote:

No problem. We just re-washed (and re-washed) the towels.
Yet, in the bathroom itself, even after almost a week of
airing out the tile bathroom with the windows wide open,
the faint moldy smell still exists, ever so faintly - but
it's definitely there.

Assuming you've cleaned and sanitized everything, try setting out an
open bowl of white vinegar. Or try activated charcoal in a bowl to
absorb odors.