Hi cstepanek
I tried UFO drip. I found it hard to apply (in winter it wouldn’t
flow and be all lumpy, requiring a heat gun which was difficult as I
didn’t want to cook my bike frame and wheels. It was quite an
ordeal). Then I found it only lasted 50-100km before getting
horribly squeaky.
Having used UFO drip and now molten speed wax, the latter is so much
easier and cheaper. A win win.
Just my experiences.
As for your questions, use metho as the final 1-3 rinses. This
cleans everything up. Have a look at the Zen Master guide PDF
published by Zero Friction Cycling. Also this video by Molten Speed
Wax → MSPEEDWAX | Molten Speed Wax - How To Clean Your Bicycle Chain Before Hot Waxing