Scratchy gain control

[Scott549]

I've got a GK head that is a few years old. The volume will periodically cut out. When I turn the knob controlling the main volume level, there's a scratchy sound and I have to turn the knob back and forth several times before I get a consistent level. This seems like a common problem with old amplifiers. Is there a good way to fix this?

 

[Scott549]

Answering my own question, it looks like there's some stuff called DeoxIT that is meant for this application. If people have other ideas, let me know. Thanks.