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About once a year I'll take the grates and baffle plates out and use a small dustpan to scrape out the worst of it along with a whole bunch of paper towels.
It's a nasty job, which is why I only do it about once a year :rolleyes:
People keep recommending that Purple Power. I have looked everywhere, but can't find it. I even tried ordering it online, and while Amazon took the order, it was later canceled because the vendor didn't actually have the product.