David - that TFA1 is quite a good idea - think I might get one for my guide camera.
I have cleaned the DSI - tried with a blower, Arctic Butterfly and finally with iso-propyl alcohol and a swab. It has remained pretty clean since I installed the scopestuff plate.
Here's the cleaning instructions on the Meade site that I followed:
http://meade4m.com/forum/index.php/t...1.html#msg2171