Can you peel it off?
Isopropyl alcohol is normally my choice of alcohol and it is reasonably safe for most components.
Rubbing alcohol is mentioned as a great thing for cleaning up silicone caulk, but that is when it's not cured. But I'm pretty sure that silicone (if that is what it is) will not be affected by it once cured.
Also, it's almost certain that it's not a nomal silicone material that you can get a t a hardware shop. That stuff releases chemicals that will eat your components while curing (acetic acid is a weak acid, but it's still an acid). This is an issue if you want/need to replace it.
Sorry that my reply isn't really helpful.