I have one of those nightmare chores I've been putting off way too
long. An elderly parent's 30 year old tile bathtub surround is falling
apart. Regrouting would have been fairly easy if she hadn't plugged up
some chinks with tube caulk over the years.

I just want to know if I bought a Dremel Tool if it would work on this
plastic-y substance. Should I but a name brand Dremel if I buy any?
Is there anything wrong with a cheaper knock-off (I know the rpms).

Thank you.