Voyager keyboard repair

[Thomas Okken]

A few weeks ago, I bought an HP-10C. Cosmetically, the calculator is in poor shape, but electronically, it works fine: it passes the self-tests, I can run programs on it, all the display segments work.

The only problem is the keyboard: some of the keys require extra pressure to register, like ON, f, +, and a few others. Given that there are traces of leakage in the battery compartment, I'm guessing there's gunk inside the keyboard, and that a good cleaning might get it back into good working condition.

Before I open it up, though, does anyone have recommendations for fixing / cleaning Voyager keyboards?