[GreenKeys] 33 cover cleaning

[Sam Hallas]

Jim Haynes wrote:
> A few years back on the telephone collectors list there was a lot of talk
> about Retrobright for reversing yellowing.

You can read all about my experiments with Retr0bright at

<http://www.samhallas.co.uk/collection/retr0bright.htm>

I found that I could get the required effect by dunking the whole case 
in a tub of TAED solution and left it out in the sunshine.

It was pretty effective on the ABS telephone cases I tested. Might be 
difficult to get a Teletype case into a bath of some sort.

Cheers,
Sam