Mike,
Yes, I agree, Robert's acetone solution is going to clean those syringes best...and while you and I might be lucky to make the materials last one or two sessions (or more in your case), he's able to use one set of syringes for an entire boat...pretty frugal....and that's one of those cool personal accomplishments we might enjoy...doing more with less....I guess the phrase, "What ever floats your boat." certainly applies here. All the best!
Bill

: i use vinegar for cleaning and use abt 2-3 syringes in rotation for gluing so
: far.

: for gluing i mix abt 6cc using the needle and as soon as finished, well flush
: out in a pint container filled w/ abt 1/2in of vinegar, wiping off any lg
: amts of epoxy w/ paper towel, then rinse w/ hotwater to disperse any
: vinegar and keep apart to dry for next day. i sluice out the needle and
: can reuse easily if still going(squirt out any vinegarred cloudy stuff-abt
: 1"glueline depending on needle length). half the time i do a good
: enough cleaning to reuse the needle the next day or time.

: altho i would rather stay away from acetone etc, roberts technique sounds
: pretty good.