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Just clean the front corrector lens as you would a refractor objective lens, is just a bit bigger , unless you have a big refractor that is.
If it is the inside surface of the corrector that is in need of cleaning, unlikely but still the same method as a refractor lens., Removing the corrector plate is easy, mark the orientation of the mounting screws before removing them so that the same holes line up again when refitting and make sure the cell is firmly seated against the tube. This should ensure that the collimation is not disturbed by much.
If the collimation needs tweaking using the star test method to check then there are 3 sets of set screw / grub screws at the rear for fine tuning the primary. Have a read of this pdf, the techniques are very similar.
mirrorhttp://www.company7.com/library/orion/Inst_makcasscollim.pdf
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