Caulking around pool and sink - help please!

I have 2 questions about caulking.

1. My kitchen sink had caulking around the perimeter where it's mounted. I don't know when this was done/installed, although by the looks of the caulking I'd say more than 5 years ago. What can I use to clean this old dry and carcking caulking? I'm going to use a clear type caulking to replace it.

1. My inground pool has a 3 step insert at one edge. Between its edges and the concrete, there is a 2 mm gap all around. Would it be safe to use caulking to seal this edge so water doesn't go in behind the step insert?

Thanks in advance.

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