Unnecessary Bicycles with Fibreglass: Softride Qualifier 650, Look 496 Tri, Colnago Super, Velo Orange Neutrino

Also, just to be complete in case anybody searches for 'ultrasonic' and finds this thread, after I was satisfied with the level of cleanliness I did three rinses in denatured alcohol. I'm no scientist, but to my understanding, the alcohol is miscible in and evaporates much more readily than water, so when it flows into the crevices of the part, it picks up the trapped water, mixes with it, and then helps it evaporate. High-percentage isopropyl alcohol should also work for this (low-percentage contains more water, and the more water is in the alcohol solution the higher surface tension it will exhibit, which will inhibit its ability to get into all the tiny crevices in your part) but it's a lot more expensive than denatured alcohol.

For each rinse, I put the shifter in a different bag, added denatured alcohol to cover, and shook it around for a few minutes. I then took the shifter out, tried to fling as much liquid out of it as possible, waited a further few minutes, and then blew it out with compressed air.

After performing the rinses, I lubricated the innards of the shifter by flooding it with Tri-Flow from an aerosol can, shifting up and down the range, and then shooting more Tri-Flow into it to try to work it in everywhere. I picked Tri-Flow specifically because it's low-viscosity; I want the lube to reach everywhere, and for it to not gum up the mechanism.

I roughly followed this resource as a guide.