Mix bleach and water in a clean spray bottle to tackle tub grout stains and apply the solution onto the grout lines. Allow it to sit for about 20 minutes before scrubbing the stains with a small brush or toothbrush.
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Oct 16, 2021 · I use a bleach pen. Leave it on for an hour or so then rinse. It cleans it without scrubbing. I've been doing this every 2-3 months for 18 ...