How can I remove caulk?
Carefully take a utility knife and cut a "beginning" point and then see if you can just pull it out in a continuous strip. If that doesn't work, then you'll just have to continue using the utility knife to cut out the caulk but be careful not to scratch the surfaces. After it's all out, scrape the surfaces lightly with a single edge blade to remove any remaining particles. Then wipe the area with some regular vinegar to remove any stubborn residue. You can then re caulk with a quality silicone caulk. Smooth out the caulk line by dipping your finger in some water and lightly going over the caulk. I've heard that dipping  your finger into alcohol works great but I haven't tried it. Good luck