I had a 1971 Bay with a giant sunroof - we used a fish tape and
compressed air blasts.   Typically the mechanism gets cranky and the
roof is left cracked...... then leavage and stems fall into the drains
and gum it up.  You might start at the bottom and work up, letting the
crud fall out with gravity.  As I recall, there were metal stubs at
the top and tubes (rubber hoses?) somewhere in there passing down through the B
and C pillars, and exiting out the bottom.

Randy Bergum
1990 Carat
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i used a long coathanger wire and then a pressurized water hose to clean them
out.

chris