This is also a good idea because any buildup of oils or other slippery liquids may cause your hand or tools to slip while removing the old caulking.
Water-based, latex, and PVA caulks will most likely feel brittle and hard. These are more prone to chipping during removal. Silicone caulks should feel much more pliable, like soft rubber. These are usually the easiest to remove.
Avoid making actual contact with either surface. For now, you just want to weaken the caulk’s bond and allow more access for the next step. If your caulk is especially hard, try heating it with a heat gun to soften it up. If the heat gun doesn’t work, skip to the next step rather than risk damaging the surrounding surfaces with nicks and scratches.
Refer to your caulk remover’s directions to find out the minimum amount of time you should allow for it to set before moving on. Generally this is about two to three hours. [6] X Research source The longer you let it set, the more it should soften the old caulk. So if the old caulk felt extremely hard and brittle when you made your test and starter cuts, allow more time for the caulk remover to be absorbed (as much as 24 hours for very stubborn caulk).
Ideally, you will be able to pull this loosened strip free of the other surface. If the bond is too strong to do so, repeat this process along the second surface.
If the gap is very small, use tweezers instead.
Remember to do the same with any bits that are deep within the gap. If needed, use your heat gun again to soften any stubborn bits. [11] X Research source
Because the gap between the surfaces is now exposed, you want to expose it to as little moisture as possible. Spray paper towels of cloths with cleaner instead of spraying the surfaces directly. Avoid using ammonia-based cleaners, since this creates toxic fumes when combined with bleach, which you’ll be using next.
Alternately, you can also use a storebought mold-and-mildew killer. [14] X Research source
If you’re using silicone caulk for a new caulk line, the area must be completely dry in order for it adhere. Water-based caulks will adhere to surfaces that are slightly damp, but doing so may increase the risk of mildew growing back. Keep in mind that since caulk isn’t waterproof, if there’s a leak in your shower, the new caulk is going to eventually show mold and mildew, as well. [16] X Expert Source Art FrickeHome Renovation & Repair Specialist Expert Interview. 14 August 2020.
