I expect you will get a lot of suggestions here. I personally prefer Dow 5200. This is very sticky, a little difficult to work with and hard to remove, BUT it will seal and last forever. What ever you use, be sure to remove the old caulk until you are into an area that is sealed well , then clean both surfaces good with alcohol. I good test for how well the existing caulk is sealing is to remove the old caulk until the surface under it is clean. Areas will bad seals will be dirty underneath.
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