Painting behind a radiator is actually quite simple, and can make a huge difference in the look of a room. The first step is to remove the radiator from the wall. Use a wrench to unscrew the nuts and bolts that secure it. Once it's off, use a vacuum cleaner to remove any dust and debris from behind. Then, use a putty knife to scrape off any old paint or wallpaper that's stuck to the wall. Now it's time to start painting! If you're using an oil-based paint, apply a coat of primer first. Then, use a roller or brush to apply two coats of paint, making sure to get into all the nooks and crannies. Once the paint is dry, it's time to put the radiator back. Make sure to tighten the nuts and bolts securely, and your job is done! With just a few simple steps, you can now enjoy a refreshed, stylish room!