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Vinegar won’t strip the wood stain from your wood, but it can help remove a different type of stain. If you’re dealing with food stains or trying to remove water rings on your wood, you can use a little olive oil and vinegar (mixed equally) to remove those stains without stripping your actual wood stain. Just rub the solution in the direction of the wood grain, let it sit, and then wipe it away with a damp towel.

Wood stains last anywhere from two to five years, depending on exposure to the elements, your local climate, the type of stain, and the surface it’s on. For instance, vertical surfaces last longer than horizontal surfaces. Some types of woods, like dense hardwoods, will require a recoat yearly, as they are too dense for the stain to absorb. In any event, apply a recoat every 2 to 4 years. As for storage, a can of unopened stain can last up to 5 years, though results may vary.

When browsing the hardware store, you may wonder about wood putty versus wood filler. Wood putty is made with plastic adhesive, whereas wood filler is made from sawdust or wood products. 

The main difference is that people use wood filler to fix the interior portions of wood. Wood putty contains chemicals that could damage the inside of wood, so it's best for exterior sections. If the crack or hole goes into the middle of the lumber, it's the right product for the job.

Wood stain does go bad, but it will last in the can for between three and six years, provided you use proper storage techniques. Storing wood stain in open containers or in extremely low or high temperatures will cause your wood stain to become unusable much more quickly. Water- and latex-based wood stains typically last for just two to four years, while oil-based wood stains can last for three to six years.