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A wire brush. Handheld, not attached to an electric grinder or something like that.
Cheap wire brushes should be available in most hardware stores. I know that ours carries them in the paint section.
Remove the nozzle and hold it with pliers or something.
Lick the frosting off...
Mmm... Microplastics
Blow on it really hard.
And then rub it for three wishes.
I just bought a new heating element when that happened to me.
I might go back with some acetone now after reading others' comments.
Not for PLA
What type of filament is that?
Maybe try a heatgun to soften it. I'm not sure, might damage the plastic casing.
PLA
PLA basically doesn't dissolve in any (readily available consumer-grade) solvents. Your best bet is going to be to take the entire unit as far apart as you can until it is metal only components, heat it with a heatgun to make the PLA soft/melt, and brush it all off with a brass cleaning brush.
Hrrmm. Does it still print? Personally I'd go with hope it kind of burns off over time with normal use. Others may disagree...
That certainly is one way to make it immediately worse, and welcome a whole cavalcade of failures throughout the machine. 🫣
Microwave
Metal piece with many pointy pieces and neodymium magnets in a microwave? The sparks will damage the item and the oven. And won't melt the plastic