I've been cleaning other peoples houses for about 17 years now, and one thing i swear by is a silver chore boy. They are a bit harder to get than the copper ones, but work wonders. I've used this on everything from ovens to showers and floors, and it's worked every time. If the oven grates are really stubborn, I use a bit of comet with it, and with a bit of work, i've made more than one stove look like new again. These also work great for built up soap scum in the shower, as they don't scratch, they're designed to use on teflon. It has to be chore boy brand tho, the low cost copies just dont work the same, and last time I got one I believe it was at ACO. Good Luck!!