If you're a "Penny-pincher" as I am, use a hammer & chisel to remove the hard stuff. Just be careful not to use a lot of muscle when hammering- tap the chisel.
This should remove most of the caulk. Finish by using a putty knife or scraper. Be sure to thoroughly clean the area with alcohol. This removes the 'oily' residue and helps the caulk adhere.
Caulk-B-Gone. You can purchase it at Home Depot for under $5 a tube. It is in the same section as the caulk. Squeeze it on the old caulk and let it sit for a short time and it will soften the old hard stuff and make it easy to remove.
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