Remove old silicone sealant
15 minutes — essential before any resealing or renovation
Old silicone sealant must come off completely before new work starts. This is the right way to do it — no scratched baths, no tile damage, no residue.
Last updated: June 2025
Only basic tools needed — most homes already have them.
Part of the Bathroom Renovation project
This is a Phase 1: Strip Out skill in the full bathroom renovation walkthrough.
If you're renovating your bathroom, start here →Before you start
This guide covers removing existing silicone sealant from a bath, basin, shower tray, or tiled joint. It is the right first step before a bathroom strip-out or before applying fresh sealant.
If the sealant is heavily contaminated with black mould, the same technique applies — but wear rubber gloves and work in a ventilated space.
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Tools & materials
- ✓Utility knife / Stanley knife— to score both edges before pulling
- ✓Filling knife or old credit card— plastic edge for scraping residue without scratching
- ✓Cloths— for applying solvent and cleaning up
- !Silicone remover spray— softens stubborn residue — worth having for old or thick sealant
Want everything in one go?
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Score along both edges with a knife
Hold a utility knife at a shallow angle and run it along the joint where the silicone meets the tile and where it meets the bath or basin surface. You are cutting the bond — not slicing through the sealant from above. Do both edges in one pass each. Why: silicone grips the two surfaces it is bonded to. If you try to pull it without cutting the bond first, it tears into strips, leaves residue on both surfaces, and can pull up tile grout or damage the bath enamel. Score first and the whole strip comes away cleanly.
Most people get this done in under 5 minutes.
Where beginners go wrong
Pulling without scoring first. This tears the sealant into small pieces, leaves thick residue on both surfaces, and can chip tile grout or nick enamel. Always score both edges before pulling.
Using a metal scraper on acrylic or enamel baths. A metal filling knife will leave fine scratches in acrylic bath surfaces. Use a plastic card or plastic scraper for residue removal.
Not checking surfaces are dry before resealing. Silicone will not adhere to a damp surface. After cleaning, wait at least 30 minutes in a warm bathroom before applying new sealant.
Worth knowing
If you find cracked tiles or loose grout once the sealant is off, fix those before resealing — new sealant over damaged grout will fail at the same point
Persistent black mould on the wall behind the old sealant (not on the sealant surface) is a sign of a damp or ventilation problem — removing the sealant will not fix that
Recommended starter kit
Five tools that cover most home repairs.
- →Adjustable spannerAmazon·Screwfix
- →Screwdriver setAmazon·Screwfix
- →PTFE tapeAmazon·Screwfix
- →Spirit levelAmazon·Screwfix
- →Tape measureAmazon·Screwfix
Want everything in one go? Get it on Amazon
What you just learned
You know how to remove silicone sealant cleanly — scoring, pulling in strips, removing residue, and preparing a surface that new sealant will actually bond to. This is a skill you will use on every bathroom project.
This unlocks:
⚠️ Watch out if you rent
Removing and replacing silicone sealant is routine maintenance. You can do this in a rented property without landlord permission — it is the same as replacing a bath sealant that has gone mouldy. Keep the old sealant if asked to prove you replaced like-for-like.