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Gas stove? Outside vented hood? Get a pair of vise-grips (if you don't
know what they are, ask at any hardware store--you want the 7 inch or
larger), turn the hood up high, turn the big burner up high, grab the
grate with the vise-grips, run the affected areas through the flame
until clean. Any common plastics that melt will burn off, but they'll
also smoke and smell awful and may produce some slightly toxic fumes.
If you have a self-cleaning oven throw it in the oven and run the
cleaning cycle. If the plastic is thick put something under the grate
to catch any drips.
If you have a bird don't do either of these--birds are insanely
sensitive to overheated plastic, instead take the grate outside and burn
the plastic off with a gas grille if you have one, or take it as an
excuse to get a propane torch (same place you got the vise-grips, also
can use it for creme brulee).
You can help the process along by scraping the plastic once it's hot--
use something cheap that you can throw away or you may end up having to
clean the scraper as well.