Wash concrete off your skin
Even though you wear rubber gloves when working with concrete, some of the stuff inevitably splashes on your skin. Prolonged contact with wet concrete can cause your skin to crack, and may even lead to eczema. Use undiluted white vinegar to wash dried concrete or mortar off your skin, then wash with warm, soapy water.
Remove paint fumes
Place a couple of shallow dishes filled with undiluted white vinegar around a freshly painted room to quickly get rid of the strong paint smell.
Degrease grates, fans, and air-conditioner grilles
Even in the cleanest of homes, air-conditioner grilles, heating grates, and fan blades eventually develop a layer of dust and grease. To clean them, wipe them with full-strength white vinegar. Use an old toothbrush to work the vinegar into the tight spaces on air-conditioner grilles and exhaust fans.
Disinfect air-conditioner and humidifier filters
An air-conditioner or humidifier filter can quickly become inundated with dust, soot, pet dander, and even potentially harmful bacteria. Every 10 days or so, clean your filter in equal parts white vinegar and warm water. Let the filter soak in the solution for an hour, then simply squeeze it dry before using. If your filters are particularly dirty, let them soak overnight.
Keep the paint on your cement floors
Painted cement floors have a tendency to peel after a while. But you can keep the paint stuck to the cement longer by giving the floor an initial coat of white vinegar before you paint it. Wait until the vinegar has dried, then begin painting. This same technique will also help keep paint affixed to galvanized metal.
Get rid of rust
If you want to clean up those rusted old tools you recently unearthed in your basement or picked up at a tag sale, soak them in full-strength white vinegar for several days. The same treatment is equally effective at removing the rust from corroded nuts and bolts. And you can pour vinegar on rusted hinges and screws to loosen them up for removal.
Peel off wallpaper
Removing old wallpaper can be messy, but you can make it peel off easily by soaking it with a vinegar solution. Spray equal parts white vinegar and water on the wallpaper until it is saturated and wait a few minutes. Then zip the stuff off the wall with a wallpaper scraper. If it is stubborn, try carefully scoring the wallpaper with the scraper before you spritz.
Slow hardening of plaster
Want to keep your plaster pliable a bit longer to get it all smoothed out? Just add a couple of tablespoons of white vinegar to your plaster mix. It will slow down the hardening process to give you the extra time you need.
Revive your paintbrushes
To remove dried-on paint from a synthetic-bristle paintbrush, soak it in full-strength white vinegar until the paint dissolves and the bristles are soft and pliable, then wash in hot, soapy water. Does a paintbrush seem beyond hope? Before you toss it, try boiling it in 1-2 cups vinegar for 10 minutes, followed by a thorough washing in soapy water.