Grout brush

/ɡɹˈaʊt bɹˈʌʃ/

[noun]

Grout brush

[NOUN]

a tool designed for scrubbing and removing dirt from the narrow spaces between tiles or surfaces

Examples

1. Use a grout brush or old toothbrush to apply the paste to the grout lines.

2. What I'm going to do is clean those baseboards, clean the floor, I'm going to scrub out the grout with my grout brush, and I'll clean the whole thing with a paper towel.