I'm with Dennis - lint free cloth (I use baby muslin sheets), WD40 and a bit of elbow grease once every 3 months. Then post racing put a little spray of WD40 on on a rail section and drive a car round slowly.
Also keep your braids clean.
Have to say the Kelvin robocleaner is appealing if a little slow (but then more thorough?)
For the occassional track cleaning, I use an old 'test and development' car with a really strong magnet to do the hard work. Something like an old SCX Nascar with a death defying magnet, flatout around the track type of thing. I put a few drops of Parma braid conditioner on the braids, put a few more drops at a few spots spaced around the track and hold on to the controller and let it rip. If the car stops on the track, I send around a second old car till it nudges up behind the first then away they go. Once the car completes the lap, I give the braids a cleanup with an old toothbrush, another few drops of braid conditioner and away we go again until I'm happy that lane is clean. As crass/brutal/primitive/cheap as it sounds, it works fine after 2 or 3 laps on my Scalex Classic/Sport/SCX track, and saves climbing around the track table.
Some of my track pieces are Scalex from the 1960's and they're still working. The rails are no longer shiny, mind you, but they still work fine so you don't need to polish the rails till they gleam like new (or have I been missing something here?)
I've also seen someone here or another board strongly recommending covering a track when its not in use.
Sandpaper (and Dremel) is a no-no I'm told on most plastic tracks because it damages the rails' surface and promotes rusting.
As an aside to all this, I read somewhere that silicon tyres clean a track by removing a lot of the rubber left by non-silicons. Personally I don't go this far but its another cleaning option.
There's no doubt that oily substances and a powerful car can clean rails very effectively, but it is essential to clean up all traces of the additive after the cleaning operation, as that same substance attracts more dust like FRS. (Flies Round Sh.. )
The 'cleaning car' will rapidly get its braids full of crap and the quick way of cleaning THEM is a soft wire brush on a dremel - this tip courtesy of Steve Carffi in USA. Steve also mentions frequent use of a 'California Duster' in between times. This legendary dust remover is used by car dealers in USA, but I haven't quite figured out what it is! Probably there is a European equivalent as our car show rooms seem able to keep their cars dust free too.
Certainly, covering disused track is also a VERY good idea too.
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