Save your used lemon pieces (from baking, lemon water, etc.)

Fill a jar with an airtight lid with white vinegar. I used about 1 cup of vinegar.

Put the lemon pieces in the jar and let them soak for a couple of days

Strain the vinegar from the lemons (keep the vinegar, compost those lemons)

Mix 1 part of the lemon-infused vinegar with two parts water

Add the mixture to a spray bottle