My shower has tile walls and a fiberglass bottom. As far as I know (I have
lived here 12 years) it has never been recaulked, and it is about time.

I started to remove the old caulk and found it is hard and grainy. Could it
be grout rather than caulk? If it is grout, can I clean it up and put caulk
over it? Or do I have to dig it out and regrout?
Or is it not grout?

The rest of the walls are in pretty good condition, it is only where the
base and the wall meet that are deteriorated.

Thanks.
Thanks.