The next time you make a roast or bake a batch of cookies in your oven, don’t let the hot air inside go to waste. After you’ve removed whatever you’re cooking, give the inside of the oven a liberal spray of a water-and-white-vinegar solution. Do this quickly, shut the door and let it sit for 30 minutes. As the vinegary solution evaporates, the inside will steam and help loosen stubborn stains and marks. After 30 minutes -- or when it’s cool enough inside -- just use a sponge or microfiber towel to wipe up the greasy mess.