Best thing to use is RIT dye, you can buy it on ebay for a few quid and it's never let me down for doing RC stuff. Quite like the wheels, real men wear pink and all that! I just bought the stock wheels when I swapped tyres... starting to regret that now!
I grabbed a can of that months ago in a pound shop of all places! As said, it's brilliant stuff. Chain of lubricants now goes TF2 > GT85 > WD40