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thetiler

wrote:

Just to save myself some elbow grease (again big shower with a mosaic
floor), does it make sense to put a scrub pad on the bottom of my
cordless sander?

The type of solution is your answer- more than how hard you
scrub. You've gotten a lot of good advice here, now just
try it.
The broad strokes you can make by hand will cover more
ground, much faster than that cordless sander w/pad. If
it isn't working, you need to adjust the cleaner you use.
Now take my advice from someone who's cleaned a
gazillion square feet of tile and grout, and start with vinegar
and move on to "grout haze remover", then sulfamic acid
if needed.
Generall grout film is difficult to remove and gets harder
with time. That is why is should be completely removed
on day one, before the grout dries.
Accept that your job didn't get cleaned off properly and
you have a problem, but be glad it's fixable. Most tile job
screw ups are permanent.
A couple of hours of cleaning and rinsing on your part
will make your tile job as good as new.

thetiler