Can an acid-free rust remover be used on polished marble?

Yes, an acid-free formula is specifically designed to be safe on delicate surfaces like marble and polished stone.

Can a protector applied by mistake be removed?

Yes, some gel graffiti cleaners also remove protectors that were applied incorrectly.

Specific Stain Removers: Rust, Grease, Wine, and Hardened Silicone

Q: What product removes old silicone residue from a grout line?

A specific silicone remover that softens hardened silicone within about 20 minutes so it can be removed with a scraper.

Quick answer: every stubborn stain has a specific remover: rust, wine or coffee, grease, and hardened silicone are removed with different products because they work through different mechanisms. Using the wrong product may do nothing, or worse, damage the material's finish.

Which stain remover to use for each problem

Stain	Product	How it works
Rust on delicate surfaces	Norust	Acid-free formula, safe on marble and polished stone; works within 15 minutes
Wine, coffee, and colored organic stains	SR95	Removes colored organic stains without damaging polished finishes
Grease and oil	Nospot	Spray format, safe on porous or untreated surfaces
Silicone, glue, candle wax, adhesive tape, and polyurethane foam	Zerosil	Softens hardened silicone within about 20 minutes; includes a scraper
Paint and graffiti	NOPAINT STAR	Viscous gel for acrylic, alkyd, and synthetic paints; also removes smog residue and grime

Before you start

Always test on a low-visibility area when the material is delicate (polished marble, limestone).
Respect the recommended dwell time: most products work within 15-20 minutes, no earlier and not much longer.
After removing the stain, rinse thoroughly and let it dry before reapplying any protector.

Stain remover or protector?

These products remove a stain that already exists. To stop it from happening again, prevention works differently: a water- and oil-repellent protector applied before the stain occurs greatly reduces the risk of it soaking into the material.