Silicone is an excellent sealant between two surfaces held in compression. It doesn't tolerate sunlight, weather, or movement very well. IMO, it really has no place in RV construction. The polymer sealants like Proflex and Dicor are superior to silicone in every aspect.
The 3M silicone caulk remover works well, especially if allowed to work for a period of time. After mechanically removing the old silicone caulk, there will be some silicone residue on the surface. That can be removed with a solvent prior to resealing the joint with different caulk.
