What's your cleaning rig?
I use M-Pro7 solvent and it cleans the whole slide on my Glock: Spray and wipe down. For the tight areas, I use a tooth pick and wrap cloth around it.
For the frame/reciever, I just use soap and water. Dip an old tooth brush with soap, scrub the internals and externals and water it down. Lastly, I blow dry the whole thing. Maybe an air compressor (hair dryer) would help.