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Make sure any baking dishes are large enough for what you're cooking, so it won't spill over onto the floor of your oven. Another alternative is to sit the oven dish on a baking tray to catch any spills.
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Use a roasting bag - this keeps moisture in your roast and won't splatter fat or grease all over your oven.
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Put a lid on it! Using an oven dish with a lid will also stop the spatter of grease and fat on your oven's surfaces.
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Every now and again, put the oven racks in the dishwasher to give them a good clean.
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Give your oven a quick wipe down after each use. When it's cool enough, wipe the interior surfaces to remove grime. You can make this a bit easier by putting a heat-resistant bowl of water inside your oven at a high temperature for 20 minutes. This creates steam inside your oven, helping to loosen the dirt and grease.
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Having a professional deep clean once a year will also go a long way to keeping your oven sparkling clean.