We have successfully used on many occasions, a product called DE-SOLVE-IT Contractor's Solvent" to remove silicone. We have used it to tackle rough jobs such as removing glued down foam back carpeting. Most important, it's non-hazardous and non-corrosive. We have used it on both stainless steel and aluminum without ill effects to the metal.
We recently bought a 1975 Argosy 22 - it's typical 70's tacky vinyl ceiling had accumulated a collection of "bugs" from the PO - regular cleaning products wouldn't budge the recent ceiling decorations - we got out the DE-SOLVE-IT and presto, the bugs & sticky were gone! (Remember to rinse WELL after using)
Our local Home Hardward regularly stocks this product - they are the ones that originally recommended it - De-Solve-it Contractors solvent
FYI and all the silicone fans out there - according to a sailboat rigger, silicone is fairly acidic and will actually promote corrosion when in contact with metal, such as stainless steel & aluminum when used in an out door environment. In its non-toxic form, it is really good to seal the glass on fishtanks!