Cleaning ur stove air vent. Put them outside on top of paper bags. Spray an even coat of easy off oven cleaner on one side. After a hour or two turn it over n spray even cost. If really yucky, repeat a few times. Next day, take to kitchen sink, with warm water n a soft scrub sponge wipe edges. With hot water spray the vent and watch all the yuck go dwn the drain. Let dry. Dont forget to clean sink afterwards.