Before you try anything: always speak to a professional before cleaning, treating or applying any product to your stone. Every slab is different, and the wrong product can cause permanent damage. Contact us or a qualified stone restorer first.
Quick answer
Limescale on terrazzo has to be removed without acid, because descalers that dissolve it will also etch the stone. Soften the deposit with warm water and pH-neutral cleaner, then shave it off carefully with a new plastic razor blade held flat. Heavy build-up is a job for a stone restorer.
First, check what you are dealing with
- Chalky white crust you can feel: limescale. Follow the steps below.
- Smooth dull patch with no crust: etching, often from past descaler use.
What you need
- pH-neutral stone cleaner
- Warm water
- New plastic razor blades
- Microfibre cloths
Step by step
Soften the deposit
Lay a cloth soaked in warm water and pH-neutral cleaner over the scale for 10 minutes.
Shave it off
Hold a new plastic razor blade almost flat and gently push under the scale. Keep the terrazzo wet as you go.
Repeat and dry
Re-wet and repeat until the crust is gone, then rinse and dry thoroughly.
Check for etching
If the area underneath looks dull, it has probably been etched by past descaler use. See fixing etching.
What not to use on terrazzo
- Vinegar, lemon juice or "natural" citrus cleaners: they etch terrazzo.
- Scourers, steel wool and abrasive creams on a polished surface.
- Mixing cleaning chemicals, especially bleach with anything else.
- Bathroom descalers, CLR, vinegar and lime removers.
- Metal razor blades and steel wool.
When to call a professional
If scale is thick or has been there for years, a restorer can remove it with stone-safe products and re-polish any etching underneath. A terrazzo specialist can re-grind, hone and polish the surface and replace missing chips.
Understanding hard water and limescale on terrazzo
In cement terrazzo, both the cement binder and any marble chips react with acid, so spills can etch the whole surface. Epoxy terrazzo is much more resistant.
Terrazzo damage shows as dull patches across chips and binder, stained binder, and occasionally loose chips.
A terrazzo specialist can re-grind, hone and polish the surface and replace missing chips.
Good to know
Terrazzo with a cement binder reacts to descalers just as concrete does, so stick to the mechanical method.
Stop it happening again
Whether yours is cement terrazzo and epoxy (resin) terrazzo, repairing it fixes today's mark; protecting it stops the next one. Our clear Stone Protection Film sits over the surface, so acids cannot etch it and liquids cannot soak in. Choose Gloss for polished terrazzo or Matte/Satin for honed and matte finishes. The protection is identical. It is installed across Sydney with a 10-year written warranty.
How we protect terrazzo · Cleaning natural stone · Hard water & limescale on every surface