Good point worth checking firstAcetone will dissolve some plastics including ABS, which is a populate case material
Acetone is used to remove silicone from moulds iirc
Isopropyl is my first choice for cleaning for this reasonProbably rubber or metal? Most plastics don't seem to like it [don't ask....].
I've never used it, but perhaps something like this would be suitable?
For discussion: most bathroom-type silicones are acetoxy-cure, based on acetic acid, hence the vinegar smell. Therefore most silicone dissolvers are likely suited to that chemistry.
I suspect that the silicones used in electronics are not acetic acid based as it seems to me that acid around electronic stuff might not be a good thing.