It's time to open the beast, 'coz I need to clean the 'sometime unresponsive' controls  

 
  
 Here's the parts to clean...
 
  
 It should be better like this  

 
 Now, let's try to remove that yellow dust everywhere on the game  
 
  
 
 ...and try for the first time the 'magic sponge' I got 
here.
 
 Well, I'm not very happy with that cheap sponge, because it disintegrates almost immediately...
 
 ...which is normal, but that one disintegrates does it very quick  
 
 Anyway, here's a first result...
 
 Mhhh, I've to found an other way for cleaning that stuff... I will use these magic sponges rather for flat surfaces, like control panel for example...