I use Dawn liquid dish detergent and one of those dish cloths with the one side that’s a plastic scrubby…warm water…if it’s only lightly soiled i might just use a soft scrub brush or even an old toothbrush if it’s a small panel. I hang it under or set it over a heat register so there’s air movement to dry it off faster after washing, or lean it against a box fan or something…don’t just towel-dry it and put it back together right away especially if it’s a steel panel…make sure it’s good and dry to avoid any oxidation.
If there is any adhesive residue I use 91% or better isopropyl alcohol first.
If after the detergent bath and scrub and drying I want to do more I use a painted surface cleaner and polish/protectant called TR3, but it will have more gloss after that so i keep that in mind…if I’m working on one device with multiple like panels and I want to polish one, I’m going to have to plan to do them all or one is going to stick out.
