I like to use sandwich bags and electrical tape to cover the MAF sensors. Then I'll give it a nice spray down. If the bay is really covered in grime/greese you can always find a good cleaner at your local automotive store, but be carefule getting it on the body paint. There are also sprays that will give it a nice shine, but I've found that they look really nice for a few days, but attract a LOT more dirt, so it's your choice what you'd like to go for.
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