[morzh]

I do not know how potent it is. I also do not know how potent I want it.
When I put it on fairly blackened sliding switch, visually I did not see any change, and I will have top wait 'till tomorrow for it to dry before I could check if it had any real effect. The black is clearly the oxidized stuff as when I touched it with a Qtip, it dirtied it.


This said, the sliding switches in this radio are not really well-accessible for maintenance.
I put the straw inside from the back and sprayed some, but I do not know where and whether it gets in the places intended. So since the pins are embedded via holes in the phenolic case, which have some spacing, I put the Deoxit right at the base of the pin. I saw the liquid penetrate, at which point I work the switch to distribute it. Like I said, I am not sure how effective it is.
Then again, if I use pro strength CC, I could not be sure it won't harm something.

Taking that thing apart.....I'd rather take on 38-690 packet switch assembly than on this one. It is my impression that this radio was created to last a long time, then die and never be resurrected or repaired. It does not lend itself to easy maintenance. No sir. Buy a new Grundig.

I suspect the howling in the speaker is due to the fact that there is some feedback from the speaker assembly when it all plugged in. When I simply put two-wire speaker in, the feedback is disengaged.

Tried other bands, including FM. Nothing so far.
Oh....the Magic Eye is not green. Whether it is due to the tube being bad, or something else - I do not know that. First I want the radio to function, then I will take care of the Green Eye.