Also a Swedish resident, I use the ”Gripen” benzine mentioned by VWatchie. And btw, the Gripen benzine works perfect as lighter fuel in my Zippo hand warmer I use a lot during winter ski tours, at the fraction of the cost for the original Zippo stuff. I use two small licqeur glasses and my hobbyist u/s machine with a squeeze of regular dish wash liquid in hot tap water. If I feel ambitious (and can stand the fumes) I add a splash of ammonia. The parts (in the natural group order) goes into the first benzine container for a few min’s and then into the u/s. After that back into the first benzine glass again with the main purpose to push out any remaining water from hidden places in the parts. The water separating property of the benzine is a cool one! Then over for a final rinse in the 2nd benzine glass and out to dry on a regular printer paper. Lately I have tried to re-use the benzine by pouring off the top section (the water is heavier and stays low) but noted I get some staining, probably from dissolved oils and grease so I will stop that and use fresh stuff every time. If I note any remaining stains on the jewels, I remove these with a wooden tooth pick. The procedure usually takes me a 1/2 hour for a regular manual movement, which works for an amateur and hobbyist, I guess. /Bsoderling Sent from my iPad using Tapatalk