Hi Jim, There was an article in one of the MRR mags some years back about the Whal Clipper Oil. I think it was RMC. Anyway in essence the article said that if you clean your track real good and then apply a thin coat of the oil that dirty track problems would be greatly reduced and that the oil would not cause any significant loss of tractive effort.
Well being the "skeptic" that I am I had to try it.

I have several 2.5 % grades on the layout and quite frankly I didn't see any difference in the way things operated. Nothing slipped.

AND I didn't have to clean the track for well over a year. I still use the stuff and I must say that it does work but of course that don't mean that it would work for everybody!!
The way I use it is to thourghly clean the track with a Bright Boy then wipe all the rails off with a rag dampened with alcohol.
Then I applied some small drops of oil to the rails all around the layout every 6-8 ft or so. I then ran a loco (no cars) over all of the track and then came back with a dry rag and wiped the rails again. I then cleaned the wheels on the loco. Boy you should have seen the gunk that was on them from what I thought was already clean track.

Anyway its reduced track cleaning from around once a month to around once a year!

And I don't see any difference in the way things operate.
One of the stangest things I've seen in Model Railroading!!!!