I read about this on the net and decided to give it a try...being the anal detailer I`m always looking for a way to clean something better.
Take the grates and put them into plastic baggies and use about 1/2 cup or little more ammonia, seal bag and let over night.
You do not need to submerge the grates in liquid it`s the fumes that break down the buildup.
Few things that I have done to these grates have worked so well, this works like a CHARM
Wish I had taken before pics because these where coated in grease build up to the point you really didn`t know they where gray.
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