[R-390] Corrosion Under Green Gear

[Barry Scott]

I finally started the tear-down of my R390.  When I pulled the green gear
from its home position, I found a considerable amount of aluminum oxidation
under it.  I'm presuming someone cleaned it with something that harms
aluminum (Simple Green, etc.).

I put a liberal amount of DeoxiT on it but that didn't really help (didn't
think it would).  Any ideas what might dissolve that?

Thanks,
Barry - N4BUQ