Garden Railway Specialist (GRS) do a mild abrasive rubber block mounted on a U/J and pole, think heavy duty LGB cleaning block that can stand up to the rigours of doing a whole track without ripping to bits and you doing your back in a d wearing out kneelers. I use an LGB block to do "spot" work around points and crossings. Don't forget the electrical conductivity of your layout is only as good as all track joints will allow. Make sure those are not tarnished, just like your rail heads. I use LGB (and other makes) for cleaning the contamination on wheels and pick ups. Any cleaning device will for care for damp railheads. Max
TRACK CLEANER HEAD W TWO HEADS | Garden Railway Specialists Tel:01844 345158 GRS Track cleaning tool here