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.

Don't waste cleaning solutions in spray bottles

If you buy cleaning solutions in spray bottles, you know there is always some left in the bottom that the tube can't reach. The way to save that solution is to save the bottle and pour the leftover into the new bottle. Another method that helps, but doesn't save all of it, is to put marbles, rice or small stones in the bottle. That raises the liquid level so the tube can reach it better.

Cheap window cleaning

Don't use cleaners, just water. Unless your windows have bird stuff or grease on them, plain water will do the job just as well as "cleaners." And if you just have to use a cleaner, for heaven's sake don't buy it. Use a little vinegar or a drop of dish detergent in water. Why pay for something you don't need?

Fool your neighbors

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. If you can come up with an old spray bottle with a brand name label on it, so much the better, but maybe you can fake it somehow. All in fun, of course.