Sealants by design are difficult to removed by design. Bergdahl Associates provides multiple ways to remove cured sealants and and uncured sealants.
Both polysulfide and silicone RTV are difficult to remove completely since they actually bond into surface/substrate. PolyGone reacts chemically with the polymer and breaks it down (depolymerizes) so it can be rinsed away without damage to the surface/substrate. This depolymerization prevents re-deposition of the reaction by-products and allow for water rinsing.
PolyGonetm High-Performance Stripping Agents