Mixing traditional (non-gel) toothpaste with a little water to make it spreadable, applying it to grimy grout, and letting it sit overnight leaves the grout bright and white after just a wipe-down with a damp towel in the morning.
Two Overnight Cleaning Tricks for a Sparkling Bathroom

A couple of household staples can do the scrubbing overnight, so the bathroom is clean and ready by morning with almost no elbow grease required.
Let Grout Scrub Itself With Toothpaste
Get the Toilet and Sink Gleaming With Vinegar
Pouring about 1/2 cup of distilled white vinegar into the toilet bowl and letting it sit overnight disinfects and reduces hard-water rings, and doing the same in a stoppered sink filled with hot water and 1/2 cup of vinegar leaves it just as clean by morning.
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