This method is nothing short of a miracle to clean kitchen hood filters. Non-toxic and cheap, cheap, cheap! The only problem you should have is finding the right vessel. I used a roasting pan, but maybe using a disposable aluminum pan would work. Add the soda at the beginning to the cool water so it doesn't fizz and overflow. As embarrassing as it may be for me to show how bad mine were, note the differences. The foremost filter in the picture is one that's been cleaned by this method.