Here are photos. Sorry, but sure how to clean this.
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There are two brass brushes in the top drawer that can be used to clean the outside of the nozzle. The extruder has to be hot for the brushes to have an affect.
Bear in mind black charred bits come with brushing. Protect your eyes. Use a spatula to gently clean off the bed.
After brushing I suggest running 50mm to 75mm of filament through the nozzle.
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