How to get old silicone caulk off and make new caulk stick
Old silicone caulk often breaks off in tiny pieces because it is difficult to loosen, and new caulk frequently fails to adhere to shower walls, separating as soon as it dries. These difficulties prevent a proper seal, leading to persistent leaks or repeated peeling failures.
What the numbers show
Counted from the threads quoted below. How we count
- This comes up 22.5× more often in r/HomeMaintenance than across the site as a whole.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1Using isopropyl alcohol or commercial caulk removal sprays to soften old caulkDid this help you?
- 2Scraping with a flat razor or plastic razorDid this help you?
- 3Using a hair dryer or heat gun to soften silicone for easier scrapingDid this help you?
- 4Cleaning the area thoroughly with alcohol or acetone before reapplyingDid this help you?
- 5Using painters tape to create a border for a cleaner applicationDid this help you?
- 6Scraping out the old material with a flat pry bar or 5-in-1 tool, then using backer rod and self-leveling polyurethane sealant.Did this help you?
- 7Using cleaning products like CLR to try and remove mold from the cornersDid this help you?
- 8Watching instructional YouTube videos and buying DIY materialsDid this help you?
- 9Cutting out old caulk with a box cutter and applying silicone caulkDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“Is there a way to loosen the clear silicon caulk to remove it easier? I’ve been trying everything I can think of but it breaks off in tiny pea sized chunks.”source ↗
“Also having trouble getting the caulk to stick to the side wall of the shower. This is the 3rd time removing caulk from this shower. As soon as it dries, it separates from the wall along the base of wrap.”source ↗
“In our shower there is black stuff in the corners tried to put CLR on there set for about 5 minutes and then clean inoffensive and it didnt take much off any ideas?”source ↗
“Is this a reasonably easy thing to do myself?”source ↗
“I’m just a DIY guy 2.5 years into home ownership and I had no difficulty doing my tub, which was my first experience with caulk.”source ↗
“The old crack filler between my driveway and foundation is cracked in a lot of places. I'm getting a trickle of water in my basement on that side when it rains.”source ↗
“What type of tool can I use to scrap the remainder off and what should I use to fill and reseal it?”source ↗
Where this came up
People with this problem also raised
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- 2How to remove and reinstall wood wall panels without ruining them
- 31How to remove old dried adhesive before laying LVP flooring