I "clean" when I start having problems with function. Usually that amounts to a field strip, wipe away crud with paper towel, wipe a again with a baby wipe; relube... done!
I typically go a long, long time without doing anything other than adding more lube. Kind of like a beater car that you never change the oil, you just add more.
Interesting point: since I switched to Kellube for everything but my carry Para and my ARs, my pistolas have been a LOT cleaner over the same time period or number of rounds as with other lubes. I know this is a Slide Glide Sanctuary, but if you try Kellube, you will probably like it better, your gun will probably run better longer, and you won't have to clean as much muck as often.