I just polish the bronze tender wheel pickups using a wire brush on my Dremel moto tool and only apply a little oil if they squeak. I know that Tim Boy has recommended that you wipe your track down with a light oil such as WD 40 to keep track clean and reduce sparks. I have not done this for the purpose of reducing sparks so I cannot comment on how effective it is. I have wiped my track down with WD 40 to keep clean and prevent rust but never paid attention to wheel spark reduction.
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