Hiya...
all you need is Windex or other ammonia based window cleaner.
I use my Badger 175 for future coats and I clean it by spraying about 20 seconds of windex through it.. removing the needle and cleaning it with windex and replacing it and spraying another 20 or so seconds of windex through it..
windex will also remove future from your models..
Delbert
P.S. here is a great link about future..
The complete Future