Funny, I just cleaned mine today! I use Zep. Spray it on, leave it for a minute, wipe it off with a paper towel, then buff the stovetop with a soft cloth. That's all I do. It takes the grease right off.
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The only place I've ever found it is Lowe's. This stuff rocks. I use it on the stove, the burners and the grates.
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Those burners had quite a bit of grease on them. It's allllll gone!