Plain white vinegar in a small mixing bowl will kill odors from painting and stinky pets. Just place it in the room and shut the door for a few hours. We did this once with one of our dogs. She smelled really bad after living with to male wolf hybrids. We brought her home in the back of my truck. She stunk up the bedrug we have in there. Placing the vinegar in the truck bed with the canopy door and windows shut for 24 hours did wonders.
Soaking rusty nuts and bolts, wrenches and small hand tools in plain vinegar for a while removes rust. Just make sure you clean and rinse all the vinegar off or the vinegar will continue to eat away at your stuff.