I did use Autosol to hand polish a few pieces after hitting them with Ranex and I got some minor surface rust. I may not have left enough of a film on it.
That is surprising, you shouldn't need to leave a film just polish and rub/buff off. I thought that Autosol would have protected it enough
![doh @.@](http://www.aussiepinball.com.au/Smileys/classic/doh.gif)