You need to be really careful, but this works great, remove the grates from your oven, turn it on to 250F, when the stuff on the bottom starts smoking and stinking shut the oven off, Very Carefully use a heat proof spatula to scrape off the burnt on crap and then use a hand towel that has been wet with cold water and wrung out to mop up the bottom. Be careful you don't get burned. It only takes a minute or two to clean the whole oven.