Not everyone cleans their pistol magazines, but that doesn’t mean they don’t need attention. Personally, I used to neglect my pistol magazines because I had a hard time getting the baseplates off of my glock magazines.
They have a detent button in the center of the baseplate, and once depressed, the plate is “supposed” to slide off – unfortunately I never have it that simple.
Luckily, I was shown a way that makes disassembling a glock magazine very simple.
Use the Glock Armorer’s Tool!
Insert the tool all the way in until it stops at the handle.
Push the tool (with the baseplate sliding) forward. You want to leverage the plate forward using the handle of the glock tool.
Unless you like searching for parts or getting smacked in the face by a flying spring, use your hand to cover the bottom of the magazine before you slide the baseplate completely off
The Complete Glock reference book, 3rd edition 4th revision.