In message <CEDD7E4739B7428E8D0C2B5990098AD9@athlon>, "Ulrich Bangert" writes:

>The findings so far are that the classical method with
>isopropanol and a brush won't work. And the internet won't give precise
>answers for that problem.

Try a mild acid like citric (lemon-) or citric (vinegar).



-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
p...@freebsd.org         | TCP/IP since RFC 956
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Never attribute to malice what can adequately be explained by incompetence.

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