I just brought the parts into my kitchen to see if I clean them in the sink, but if it gets too messy I'll take them to work on Monday since we have a professional parts cleaner.
The sooty sort of dirt I've had on my hands since fondling the parts seems to easily wash off with mild dish detergent. So I'll try just brushing the parts with that and water. I think the dirt is just mostly oily vapor depositions over time.
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