Window cleaner

This might not be officially "frugal," but it addresses a problem frugalites sometimes have: finding ways to bypass the questions and strange looks.

Use a little vinegar or ammonia in water to wash windows - that's commonly known - but if you want to fool your neighbors (spouse, mother-in-law, etc), put a drop of blue food coloring in it. They'll think you're using a commercial window cleaner.

Free pot and dish scrubber

Take a nylon or plastic net produce bag and roll it back on itself until it's formed a ball of sorts. Tuck the ends under and secure if necessary. Alternatively, twist a bag into a small ball and insert into another net bag, then twist this bag closed and turn the ends back over the ball. That makes a free dish scrubber. Make one for the car windows or other outdoors scrubbing chores, too.