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
Rust stains in limestone need a rust-removing poultice made specifically for marble and natural stone, applied thickly, covered and left to dry. Never use an ordinary acidic rust remover on limestone: it will lift the rust and etch the surface at the same time.
First, check what you are dealing with
- Orange or brown ring the shape of a can or tin: rust transfer.
- Orange spots with no obvious source: possibly iron within the stone. Ask a restorer.
What you need
- Stone-safe rust poultice
- Plastic wrap and tape
- Plastic scraper
- Gloves
Step by step
Remove the source
Take away the can, tin or metal object and wipe the area with warm soapy water.
Apply a stone-safe rust poultice
Use a rust remover labelled safe for marble, following its instructions. Most are applied thickly and left to dry.
Cover and wait
Cover with plastic, tape the edges and leave for the time on the label, usually 24 hours.
Remove and assess
Scrape off with a plastic scraper, rinse and dry. Repeat once if needed.
What not to use on limestone
- Vinegar, lemon juice or "natural" citrus cleaners: they etch limestone.
- Scourers, steel wool and abrasive creams on a polished surface.
- Mixing cleaning chemicals, especially bleach with anything else.
- Household rust removers and oxalic or hydrochloric acid products.
When to call a professional
Deep rust, or rust that seems to come from within the stone, needs a restorer. A restorer can re-hone limestone and repair chipped edges with colour-matched filler.
Understanding rust stains on limestone
Limestone is one of the most absorbent benchtop stones. Oil and water can darken it within minutes, and stains tend to sit deeper than they do in marble.
A restorer can re-hone limestone and repair chipped edges with colour-matched filler.
Good to know
Limestone absorbs rust quickly on wet surfaces. Act while the ring is still orange rather than brown for the best chance of full removal.
Stop it happening again
Whether yours is French, Portuguese (Moleanos, Moca Creme) and Australian limestones, 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. Most limestone is honed, so the Matte/Satin film is the usual match: it keeps the natural, low-sheen look. It is installed across Sydney with a 10-year written warranty.
How we protect limestone · Stain removal guide · Rust stains on every surface