Any tricks to freeing up stuck seacocks?

Any tricks to freeing up stuck seacocks? Our older sailboat spent a couple of years on the hard before we bought her last year. The seacocks were sticky but functioned and I believe she was well-maintained before. She was in the water for about 3 months and then back to dry dock for 6. Now they are all problematic. We are planning on spraying them with penetrating spray and using more leverage when I get back there next week. Other recommendations?
Some of the valves also have some small amount of green corrosion on the outside but do not appear to be damaged. How serious is that?
Thanks in advance!

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