We just bought a D log home that is 6 years old in Vermont, the previous owners used clear silicone for air leaks. This did not work and now I want to clean out the silicone and use Sascho conceal. The inside pine logs were sealed with a polyurethane finish I think. Do I have to just ”mechanically” clean the silicone out or do I need to clean it with a chemical? If so what type? Thanks