While i'm sure the gun scrubber stuff is fine if used properly... i'll skip the hassle and risk.
I always clean my guns with a combination of Hoppes #9 Powder Solvent, Outers Gun Oil, and either Silicone Gun/Reel Rag (for Blued Steel, Nickel, and Anodized Aluminum) or a Lead-Free Gun Cloth for the stainless hardware.
I don't own a Glock (yet... tryin' to remedy that), but as far as I know it's not heavily dissimiliar in materials to other firearms, so here's what i'd do:
Go through the usual disassembly of your Glock (REMEBER THAT CHAMBER CHECK!) and then:
Take the Hoppes... run it all over the insides and outsides of the slide and also the feed ramp (if it is steel, not sure about this), then run a dry cloth through to remove all the hoppes about 20 or so seconds later, run several hoppes-soaked patches through the bore, when satisfied that it's clean, run a dry patch through to remove hoppes residue.
Ok now... put some of the gun oil on a patch or rag (I find that old undershirts work exceptionally well for these purposes) and run that through the guide rails of the slide and frame, also if you have a STEEL GUIDE ROD (the standard glock guide rod is not steel) run the oil lightly over the guide rod, not excessively, but give them a light oily finish.
Ok reassemble that doggie and make sure there is no oil or hoppes touching any polymer parts, if it is, wipe it off. Next MAKING SURE THE GUN IS UNLOADED AND THE MAGAZINE IS REMOVED cycle the action several times (10 to 20 times) and once again wipe off any excess (especially on the polymer parts), notice how smooth that is? Aint you glad you listened to good ole Y.C. about lubin' dem guide rails?

Now go over the slide with the silicone gun rag (don't worry about applying the silicone rag to the polymer, it does nothing either way)
Voila! One clean glock ready to rock.
Hope this helped