Just tried the above from the inside corners of the joystick and it works. I really didn't think it would but it did like magic. Had the usual slow sticky 1/2 deflection J pot in hardware diag and figured I would try it and it works...That is AWESOME....
True it does work. But......use caution when using it. The product comes out very cold and will cause some plastics to disintegrate after use. I am not saying it will happen over time, but it can happen right after using it.
Also, always allow it to completely evaporate after use and allow it to sit for at least 30 minutes to let the plastic get back to room temperature. I learned this the hard way when I first started to use this product 20 years ago.
A bast of air as Craig said works well and I feel it should be the first means of attack.