Unscrew stuck valves

[pjv]

Sounds tricky. I'd be too scared to even let a drop of slide grease onto my valves. I just put a drop of valve oil on the caps from time to time during standard "maintenance".

[iiipopes]

As Tubatinker said, you use only the tiniest dab. It stays on the outside of the threads of the casing, and as you screw the cap down, the threads naturally pull it out and away even more, so there is no way the grease can get into the valve casing unless you are just sloppy.