I find that silicone rubs off glass with little effort. Use a razor blade to scrape off as much as possible. This should remove most of it.
However if you have trouble getting it off, I recommend you pick up a pair of latex surgical gloves and after putting them on, wash scrupulously since they are usually talced to facilitated easy insertion of your hands. I know of no solvent that will remove cured silicone. I have heard the WD-40 will remove it, but have never tried that approach. With very clean dry surgical gloves you will find that the silicone will roll off the glass with a little effort. Be sure the glass is absolutely clean as well, in case a particle of dust is not present to produce scratches.
In my hands, WD-40 had very limited effect on hardened silicone attached to glass. I tried a cleaning agent for glue ("Goo Gone") and that did the work without much effort.
There should be a small Allen screw underneath bracket. unscrew this and slide it up off piece that is glued to windscreen.
get the axe and chop 'em off
They are known as windscreen wipers in Britain.
Hen
You simply cannot. Sorry.
No
Gremlins
You can shrink your silicon bag by washing it off in cold water.
Autoglass....
it will bust the car winshield
yes
sounds like a short to power somewhere in your wiper control module, and or relay circuit. well just get it check by your nearest auto dealer. Next answer: Why would you need the windscreen wipers on when the vehicle is off? I don't think windscreen wipers work on any modern car that I know of with the vehicle engine / ignition switched off!