Grill brush, scrape the groves with the Grill Grate "finger" spatula, and then let them burn off. Easy. They're definitely worth having, I've got enough of them to use on my Summit gasser and the kettle. Grilled up some killer strip steaks on them last night !
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Depends who's looking. If it is a gig with a lot of looky-loos out comes the Purple Power and the pressure washer. At home grab another beer and forget about it.