Use weed trimmer line or something of the sort and just force it through the lines. You’ll see holes in the front corners when you open the sunroof all the way. Also vacuum/clean out that channel
There's also drain holes at the rear of the sunroof.
Use the weed eater line in these as well, don't use compressed air to try and clear the drain lines as that can blow the drain lines apart at the various connections/fittings in the head liner.