Product review (5 stars): Come out of the dishwasher just like new!
You never know when something will be discontinued, so I purchased several sets of these for my Broan 36-inch hood.

When one set gets a little dirty, I run them through the dishwasher on the bottom rack and they come out like new.  When you have more than 1 set, you can still use your hood while cooking while the other is being cleaned.