Tonka, consider a quality heated commercial unit if you really want to get away from solvents completely. The hobbyist machines won't completely restore the bypass circuits in 15-20 year old Mikuni's that are seeing the light of day again in your hands for their first cleaning.
I use an Omega 14 gallon unit now and it runs all day 2-3 days a week in season, it get's hot enough to save you the additional steps of fishing the carb out of a cheaper unit and transferring it to a hotter bath to bring the temps up high enough to flash off residual moisture, otherwise you're right back to chasing out the circuits with an acetone based solvent again.
When the cycle is done I just raise the basket up on to the angled drain setting and let them flash off and dry until I'm ready for them, I wire a metal ID tag onto each carb body and make a note of it on the work order before they go swimming so you know what goes back where after it's cleaned.
I easily recoup the replacement cost of the machine every year on what it saves in canned cleaner, not to mention the health and environmental benefits of not constantly handling solvents.
The best recipes for cleaning solvents aren't published anywhere, PM me and I'll share the secret ingredient with you.
