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Even though we put it off, we'll probably end up cleaning the range hood during the course of our kitchen cleaning. To clean accumulated dust, grease and grime from the metal filters or screens of your range hood, simply spray with oven cleaner, let sit 15 minutes and put them through a normal wash cycle of your automatic dishwasher. For best results use a soap recommended for washing dishes that are greasy.
This works, but a little stinky and some folks might hand wash dishes. I used an oxy-clean type of powder and lightly boiled the whole mess in an over-sized pot. It's shocking how much grease is trapped. For gooey filters, more boiling may be needed. P.S. The pot is cleaned too!
What if you don't have an automatic dishwasher?
a better product for cleaning hood filters is a product bought at costco called oil eater and it is not as hard on the protective coating of your filters as oven cleaner. it melts the grease away as you watch it and you wipe it off with a wet cloth.
I just put mine in the dishwasher regularly. It works real well. Of course, if there is a lot of grease buildup, it might not work so well.