Warm soapy water will do, just make sure you oil it afterwards to prevent it rusting more. A bit of cruft in the slot is no big deal but you want to clean the pivot area and get some oil in there.
@hiraethus started
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Warm soapy water will do, just make sure you oil it afterwards to prevent it rusting more. A bit of cruft in the slot is no big deal but you want to clean the pivot area and get some oil in there.