White marks on quartz worktops are one of the most common worktop complaints. They can appear suddenly and seem impossible to remove. Here is what causes them and what can be done.
Cause 1 — Limescale and Hard Water Deposits
The most common cause of white marks on quartz is limescale — mineral deposits from hard water left to dry on the surface. In hard water areas (much of the South East and East of England), tap water evaporating on the worktop leaves a white calcium carbonate residue.
Solution: A solution of diluted white vinegar or a proprietary limescale remover (check it is safe for stone) applied to the area and left for a few minutes before wiping usually removes limescale deposits. Do not use abrasive cleaners.
Cause 2 — Bleach or Alkaline Cleaners
Some cleaning products — particularly those containing bleach or strong alkalis — can react with the resin in quartz and leave white marks or cause surface etching.
Solution: These marks are often permanent and may require professional assessment. In some cases, the affected area can be polished to reduce visibility.
Cause 3 — Thermal Damage
Exposure to very high heat can cause the resin in quartz to degrade locally, leaving a white or opaque mark. This is most commonly caused by placing very hot pans or baking trays directly on the quartz.
Solution: Thermal damage to quartz is the most difficult to address. The affected area may be repairable by filling and polishing. Send us photos for an honest assessment.
Cause 4 — Wax or Polish Residue
Some cleaning products or waxes leave a white residue when dry, particularly if over-applied.
Solution: Remove with a clean damp cloth and appropriate surface cleaner.
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