When I started in G scale in '76 the TCL was not around, so during that time track cleaning consisted of a black of wood & a sheet of emery paper!
OK So 30 odd years later, my track cleaning equipment remains exactly the same!
I did contemplate buying a TCL when they were launched but there were a few reports of problems with them so instead of spending the £250 ish they were in those days on one, I bought a second RhB crocodile instead!
Personally I dont see any problem in hand cleaning the track, it gives one a chance to get close to it once in a while to repack the ballast and perhaps pull out some weeds before they get too big!!
Its not as if my lines have been large, but they were definately not small ones,
My recommendation to any one contemplating a TCL is to think carefully as to whether you would rather have a loco you will use frequently which looks like a loco or tie your money up in something that may save you a bit of time, but not be used on a fequent basis.
There is just one other point though I would make, I have a large loco policy!!
I tend to run only the larger LGB locos, those with 2 motors, the main reason being is that performance is usually faultless and I like large locos, this has a bearing on track cleaning requirements, as the multiple driven wheels tend to keep the track cleaner in use, although I know of one guy who runs several small locos who just couples or 3 together to clean his track!!