Remove bumper stickers
If those tattered old bumper stickers on your car make you feel more nauseated than nostalgic, it’s time to break out the vinegar. Saturate the top and sides of the sticker with undiluted distilled vinegar and wait 10-15 minutes for the vinegar to soak through. Then use an expired credit card (or one of those promotional plastic cards that come in the mail) to scrape it off. Use more full-strength vinegar to get rid of any remaining gluey residue. Use the same technique to detach those cute decals your kids used to decorate the back windshield.
Clean windshield wiper blades
When your windshield actually gets blurrier after you turn on your wipers during a rainstorm, it usually means that your wiper blades are dirty. To make them as good as new, dampen a cloth or rag with some full-strength white vinegar and run it down the full length of each blade once or twice.
Keep car windows frost-free
If you park your car outdoors during the cold winter months, a smart and simple way to keep frost from forming on your windows is by wiping (or, better yet, spraying) the outsides of the windows with a solution of 3 parts white vinegar to 1 part water. Each coating may last up to several weeks — although, unfortunately, it won’t do much in the way of warding off a heavy snowfall.
Care for your car’s carpets
A good vacuuming will get up the sand and other loose debris from your car’s carpeting, but it won’t do diddly for stains or ground-in dirt. For that, mix up a solution of equal parts water and white vinegar and sponge it into the carpet. Give the mixture a couple of minutes to settle in; then blot it up with a cloth or paper towel. This technique will also eliminate salt residues left on car carpets during the winter months.