At last the sun shines and the car stays clear of mud from the country roads where I live.
What I would say about Carbon Grey is it is a bugger to keep clean even when it does not rain. I always use the local car wash boys to do it, great job too, but some water marks always drip and show. But the worse bit is the tailgate area, which shows up dust and within two days is pretty mucky after the due lands on it at night.
I think the answer with this colour is you need to wash it regularly. I might go for white if I get another one as they always are easy to clean and do not need wash leathering afterwards, except for the glass areas.