Seeking advice: How to safely dispose of old or ineffective DIY eco-friendly cleaning solutions?

I like the kitty litter idea for absorbing liquids. Another method I’ve found useful is to let the solution evaporate if it’s safe to do so. I leave it in an open container in a well-ventilated area until it’s dry, then dispose of the solid residue. It’s a bit time-consuming but effective for small amounts.

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