I agree, it must be some kind of record (lack of time? extreme lazyness? ;-) Flickr's link might be enough, as it is basically the same shutter. RJBender's tips are also useful.
Franka used to name their cameras rather randomly, and sometimes the same camera with the same features appears named Solida II or III, or even plain Solida.
To access, clean and lubricate (only in a couple of specific places and in a very very _very_ tiny fashion) the slow speeds cam, removing it from the camera is almost mandatory (at least if you want to do it the right way).
It's actually pretty easy, and does not need a _full_ disassembly of the shutter (you will need however to remove metal covers and, if I were the OP, the glass elements).
The naphta solution may be a temporary correction, but most of the time this only moves dirt to other places rather than removing it.
Solidas are great and fun cameras, worth the repair - but maybe you can start with a simpler model, L (or E as in Entfernungmesser, german for Lightmeter) are not as common as the non-L models.
