As an update to this ancient thread I started in 2013...
I have found that ZEP Fast 505 works about the best for moderate degreasing without attacking the aluminum as much as Purple Power or Industrial Purple does.
For super heavy grease I haven't found anything that works as well as the standard (yellow can) Easy-Off Oven Cleaner. It does attack aluminum though, so about 5 minutes on the surface is about max.
Nothing I've tried beats it.
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