Took DC to the country park today, and while waiting for a space in the carpark, noticed another mum packing up. Before folding her buggy into the boot, she pulled out a scrubbing brush and scrubbed each wheel! She then replaced it into its plastic baggie cover, popped it into the bottom of the buggy and happily loaded it - mud free! - into her boot.
Am now eyeing my own grubby-wheeled buggy with a new perspective entirely!
Ah well, it matches the grubby, muddy dog....