If your caulk was moldy and you're concerned about spores the caulk will not dry.
How To Remove Dried Caulk From Wall. This site might help you. At this point, you can and should apply new caulk.
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Learn how to remove old, cracking caulk from a bathtub. I guess you have figured out it's always best to install the same sized or a wider trim to avoid this from. Also, there is a number of caulks and they require different amount of work and tools to remove.
As caulk dries out over time, it can begin to peel and crack, leaving the joint beneath it vulnerable to moisture and mildew.
These are some of the best tips and tools used by construction experts. It's been on there for who knows what, 10, 20 years. The material grabs onto and holds virtually any surface. I can't see how it then i let the shower dry for a few days to make sure there was nothing left alive in the gap.