yes, a windows cleaner.
That is perfect for Oldies, and when it`s dry there is no rest what can build a M Ohms R
I have tested that long time, it works. Also for washing the solding stripes and components in the glowing Tekscopes.
For the cases, it is to use with a plastic brush, after drying is to polish dry with a textil
the ceramik isolated jacks from a diff are to clean with pure IPA, 3 times.