How many letters does the top answer for “the act of cleaning a surface by rubbing it with a brush and soap and water” have?

The most common answer is scouring (8 letters).

Crossword clue: the act of cleaning a surface by rubbing it with a brush and soap and water

3 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

scouring 8 letters wn-def

the act of cleaning a surface by rubbing it with a brush and soap and water

scrub 5 letters wn-def

clean with hard rubbing

scrubbing 9 letters wn-def

the act of cleaning a surface by rubbing it with a brush and soap and water