Bowls or buckets of water, freshly sliced onions, lemon wedges, vinegar and lemon or vanilla extracts are all good ways to get rid of paint odors. These methods generally work within a few hours or overnight, depending on the strength of the paint fumes.
Placing one or more buckets or bowls of water in a room with paint odors causes the water to absorb the solvent vapors that create the odor. Vinegar or lemon can be added to the water if desired, as they help to speed up the absorption of the vapors. Lemon or vanilla extracts can be mixed with paint to help reduce the odor before it is applied, though they may affect the color of the paint.