[morzh]

I do it to the whole thing, with the trimmers. Did both washing in dishwasher and soaking in dishwashing liquid, with soft long brush agitation and good tap water rinse.

The latter got me better results - bright shiny cap with no residue. Dishwasher worked fine, but it dulled up the vanes a bit. Plus some powdery light residue that though did not affect much was still an extra that I could do without.