How to Remove Caulk Off a Fiberglass Shower Stall


Caulk is used around areas such as bathroom sinks and fiberglass shower stalls to keep moisture from seeping behind the fixtures and producing mold. The caulk is a thick cream that hardens into a rubbery substance after applying. Over time, the caulk begins to shrivel and needs replaced. Removing caulk from fiberglass involves certain tools and products to ensure complete removal of the old caulk before placing new on top.

Things You'll Need

  • Rags Straight-edge razor Rubbing alcohol Bathroom cleaner Sponge
  • Moisten the caulk by wiping with a wet rag. Place a straight-edge razor flush with the fiberglass next to the caulk. Work the razor under the caulk slowly, scraping as much excess caulk from the shower stall as possible without scratching the fiberglass. Wipe the caulk pieces from the fiberglass with a damp rag.

  • Soak old rags with rubbing alcohol, and place them over the remaining caulk. Allow the rags to remain on the caulk for three days. Pour additional rubbing alcohol onto the rags if they become dry during the three days. The alcohol swells the caulking, allowing it to push from the fiberglass surface.

  • Remove the alcohol-soaked rags. Wipe the loosened caulk with a damp rag, and it remove from the fiberglass shower stall.

  • Spray a bathroom cleaner on the area and wipe clean with a damp sponge. Dry the area with a clean cloth before replacing the caulk.

Tips & Warnings

  • Use caution when cutting with the straight-edge razor. Work the razor slowly to avoid damaging the fiberglass or cutting yourself.

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  • Photo Credit Bathroom image by Nikolay Okhitin from
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