In plain English, it is a specialized detailing brush or putty-like pad shaped specifically to clean the tops and sides of buttons without pressing them.
In arcade and pinball machine repair, a "key top" specifically refers to the locking mechanism on a game cartridge or panel. A allows a technician to unlock a protective glass panel, clean the underlying surface with an integrated brush, and lock it back—all without switching tools.
Combo Cleaner operates on a "freemium" model, where basic system maintenance tools are free, but active security features require a premium license key.
: Generally runs efficiently without significant system lag. Support Limitations