What is the best way to clean iron grates from m a gas stove
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https://www.hometalk.com/diy/clean/ovens/cleaning-stove-top-grates-8885443?r=2
Cleaning Stove Top Grates
If they can be removed you can use a spray stove cleaner
Put them in a large (30 - 50 gallon) black trash bag with a couple cups of amonia. Tie bag shut and set outside overnight. The next day you can take a scrub brush to them and wash in hot, soapy water. Works great!
Try to soak in hot water and vinagar