Homes & Gardens' grout guide distinguishes light surface marks from deeper staining. For lighter deposits, it suggests beginning with a gentle cleaning approach and using a small brush where a cloth does not reach the tile lines.

Start Grout Cleaning With the Gentlest Suitable Method

Check the tile and grout manufacturer's approved products, especially around natural stone and sealed surfaces. Rinse residue and avoid damaging weakened joints with excessive pressure. Persistent discoloration in a damp bathroom may also require better moisture control or repair, rather than simply repeating a more aggressive cleaner.

Porous grout can collect stains while strong scrubbing risks making its condition worse.