Cleaning grout lines between ceramic tile.

If you want it to shine, just a mixture of baking soda and 30% vinegar.

I didn't think it would work but man, it shines now. It essentially acts like a bleaching agent. You'll need to open a window though b/c it's potent.

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without getting on hands and knees

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Vanity is hard bro

I had good luck with Black Diamond Grout Cleaner, a toothbrush, and hands and knees. If someone suggests a no-scrub method, I’m all ears.

Get a drill brush with an extender and you can sit in a lawn chair while scrubbing your grout.

I use hydrogen peroxide diluted with a little water.