It looks like silicone sealant. You should be able to scrape it off. Try using a tool that's not sharp enough too cut the wires such as a flathead screwdriver and pliers or tweasers.
It looks like silicone sealant. You should be able to scrape it off. Try using a tool that's not sharp enough too cut the wires such as a flathead screwdriver and pliers or tweasers.