Darkstar: if all you've done is blast it with CLP, then it seems you are afraid to take it apart.
Do not be afraid. Go to
glockmeister.com/slidedis.shtml. Follow the directions there for complete slide disassembly. It's pathetically simple. Use a small screwdriver instead of the disassembly tool. Don't let the springs go flying when you remove the cover.
Clean everything out real good. Blast the slide, all passages and parts with any good DEGREASER (I like plain trichlorethylene based brake cleaner, but if you have a religious aversion to that, MPRO-7 works damn good, too). Use lot's of Q-tips. Make sure it is all clean and dry. Compressed air helps as well, if you have it. Put it all back together DRY. If your degreaser has left a chalky finish on the surface of the slide, you can wipe it VERY LIGHTLY with your favorite lube to restore it to a more aesthetically pleasing shade.
You've got to love Glocks. They are pathetically simple to gunsmith, as long as you aren't messing with mod's.
Darkstar, everything else you need to know about maintaining Glocks is located at
glockmeister.com/glockinf.shtml.
Socomcen: the usual Glock testimonial, but any weapon you are going to stake your life on ought to be detail stripped, detail cleaned and fully inspected once a year. This goes for carry weapons even if they aren't shot very much. The most amazing lint balls and other dirt come out of carry weapons. It's even more important if you are training with it as much as you should.