You are talking about the condenser outside, yes? You clean it with a water hose. The thing gets rained on all the time. It doesn't short out in the rain - and you most certainly will not be removing the protective panel covering the controls.
Your goal is to clean the coils of the condenser. So air can travel through the coils to allow the refrigerant to condense more efficiently. Just use your thumb for pressure, and carefully spray from the outside into the condenser until the coils look clean.
I'm a universally licensed hvac mechanic, have been since 1995. I've probably cleaned more than a thousand condensers just the way I (hopefully) explained. And you can wash them while they are running. I've never once been shocked by the electricity in the control panel.