Elektor Formant Modular

Hi, I'm new to the group and never expected for such a group to 
exist anyway!...
I just took my old Formant out of the 'mothballs', cleaned the 
spiderwebs off and connected it to my midi-setup using the old 
Roland MPU-101 interface that I have...

..and voila... it still works!!!!! I built it with a friend of mine in 1979 
and it still works!!!!!!!

And I must say that the warm analog sounds can't be beaten - 
neither can the possibilities of just plugging whatever module's 
output into whatever input.....  no-one who has made a preset for 
you... DIY in any way...

My formant has
4 VCO's
4 ADSR's
2 VCF's 12dB
2 VCF's 24dB
2 RFM's
2 LFO's 
2 VCA's
1 COM
1 Noise
1 RingModulator
1 Staircase generator (own design)
1 Frequency counter built-in for tuning

Only thing is that the pots and switches might crack or don't 
really works as they should
Anyone of you guys know of a way to clean them properly without 
using ContactSpray, 'cause that can do more damage after a 
while.....

cheers
Hans