Black lycra shorts. Wipe the hands as best you can on grass or a co-riders shirt and then polish on the black lycra- It doesn't show.
Best bet is the disposable gloves but if you are like me- I would carry the baby wipes aswell. In fact even better- Go to a-(I would say McDonalds but that is a dirty word at present)- Fast food outlet and save the prepacked hand wipe and put it in the Saddle bag.
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How long was I in the army? Five foot seven.
Spike Milligan