Best way to get cylinder unseated from gasket

Hello all,
So I’ve been doing a hand full of top ends recently and there is always that one bike or ATV that has a cylinder that just does not want to come off. I guess gaskets work really good as epoxy after being compressed for a while. Lol.
Any way what are some methods yall use to get stuck cylinders off? I guess they might make a chemical that can soak into the gasket from the side but just wanted to hear how everybody does it and what works best. I can eventually manage to get them off, but not usually as proficient as I like. Lol

Any thought?

Thanks,

Pierce