I noticed that some composts produce a dark fluid after watering but it seems to become less dark as time goes on. If it’s fresh compost, maybe it’s worth giving the pots a good soak a few times off the paving. The cloth idea makes sense.
I think the stain or sediments washed out is nutrients in the compost, probably from decaying organic matter; not much you can do to stop that. J-cloths, wipes etc will have no effect and will be plastics ending up in the watercourse eventually so I don't think it's a good idea to use those.
Based in Sussex, I garden to encourage as many birds to my garden as possible.
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