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Things You'll Need
Instructions
Disassembly
Refer to your user guide for specific disassembly instructions for your 9mm pistol. If your instructions are unavailable, search online for a reputable guide.
Unload your weapon and clear the chamber by racking the slide back and checking for a round in both the chamber and the barrel.
Locate and press the slide release on your model of pistol. Some pistols require racking the slide back, most often with double-action/single-action handguns and those with external hammers. If the handgun has an internal hammer, the slide release is most likely a small pin that must be depressed and pushed through the slide; with the slide unlocked, pull it away from the frame.
Release the recoil spring, most commonly by pulling it away from the underside of the barrel.
Pull the barrel out of the slide. Most barrels should come out easily after the recoil spring is removed; refer to manufacturer instructions if you're having difficulty.
Cleaning
Apply lubricant to one of your toothbrushes, and brush the frame, removing any built-up reside. Pay special attention to the moving parts of your pistol, like the slide, the hammer, the area around the barrel and the magazine well. Lubricate the frame again, using an oiled cleaning patch.
Screw the correct diameter bore brush onto the cleaning rod and generously apply gun solvent. Holding the barrel in your off hand, firmly push the cleaning brush into the barrel, running it along the length of the barrel and returning at least ten times times. Be careful that the brush is the correct size for the barrel, and never reverse direction while the brush is in the barrel.
Attach the slotted patch holder to the brass rod and add a cleaning patch, and carefully run the patch through the barrel until the new patches are clean; be careful to use an appropriately sized cleaning jag or holder, so that the patch is firmly fixed inside of the barrel.
Run a lubricated patch through the barrel until the bore is wet with oil, and then run a second dry patch to clean off the excess. Wipe the outside of the barrel down with a lubricated patch, and wipe off the excess with another dry patch.
Apply a small amount of oil to the internal components, especially on the recoil spring and guide, the sear of the pistol and the slide groove. Rack the pistol several times, to distribute the oil and to feel for friction.
Clean the locking mechanism of the slide and the extractor thoroughly; a dirty ejector or breech face can cause failures to feed and jams.
Use a screwdriver to tighten all of the screws in the pistol.
Verify that the sights of your pistol are positioned correctly, check your barrel again for residue or pits in the grooves, and examine the crown, or muzzle, for any irregularities which could hinder accuracy.