Diagnose First: Limescale, Mold or Soap Film?
Limescale is a hard white or grey crust around tap outlets, on shower glass and at the bottom of basins, growing as hard water evaporates. It feels rough to the finger and does not wipe away dry.
Mold shows up as black, green or pink spots in tile grout, along sealant edges and under shower curtains, often with an earthy smell. It concentrates where surfaces stay wet and air does not reach.
Soap film is a grey, slippery or greasy layer that gathers on shower floors and glass. It often shelters limescale and mold together, so it should be removed first with a suitable cleaner before you treat what lies beneath.
Signs That Help You Tell Them Apart
- A hard white crust around the tap suggests limescale
- Dark spots in grout and sealant with a damp smell suggest mold
- A slippery grey layer on the shower floor suggests soap film
- Stains that return within days despite scrubbing point to a deeper moisture issue
- Pink tinges on curtains or corners may be bacteria rather than mold
Diagnose before treating. An acidic cleaner removes limescale but does nothing for mold, and bleach masks the look of mold but does not remove a mineral crust.
