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I've never taken apart a Schmidt-Cassegrain, but I do wash the meniscus (and primary mirror) of my Maksutov-Cassegrain about once every two or three years. Over time stuff just seems to get into the tube, after all it's not a sealed system.
I take care to replace everything in the original orientation and tighten the screws to just hold things in place without rattling. I don't think the orientation matters much with my scope, though, I had put it together differently once on purpose and it didn't seem to cause any degradation to the star test images.
Cheers
Steffen.
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