I never try on those, but I know what you talk about.
1. Sure, but I still recommend condom.
2. any 2 ways is ok, this thing is too simple la. if you have condom, no need to
wash often.
3. of course use some medical alcohol to clean it up ... it should just have
some machinery oil used for molding ...
Again, I don't recommend those 粉紅軟膠的飛機杯,
it is not the real thing... so different ...
study good, get a nice job, tons of gf is waiting for you...