[Boatanchors] Dark deposits on rotary switch wafers

[Rob Atkinson]

I'm a little surprised you can get TarnX in Korea but that's good that
you can get it.

The only other thing I can think of is carefully removing the deposits
with a dremel sanding wheel.

To be honest, if it were me, and the deposits were only cosmetic, I'd
decide to let well enough alone and live with them.  They read like
silver oxidation.  One of the basic steps in the art of restoration is
knowing when to leave something alone.  With any spray you risk
damaging some part nearby.  It's hard to control where the chemical
goes and some may damage silver contacts.

73

Rob
K5UJ
On Sun, Aug 12, 2018 at 9:09 AM "Yongsurk Lee, HL1FB"
<yonglee at yonsei.ac.kr> wrote:
>
> I am trying clean dark deposits on metal part of rotary switch wafers in old vintage equipments.
>
> I want to make them bright and shining.
>
> TarnX seemed work but it was difficult to use on unexposed wafers.
>
> Does someone know spray type cleaner?
>