I've had a range of colours and live down a long muddy track. The light grey car showed the dirt up far more than my current midnight blue one.
Many moons ago, I was told by a car fanatic never use a drive through car wash, The brushes damage the paint work. This a quote from Car magazine:
'These machines are essentially like slapping your car with a dirty mop, causing hundreds of deep micro scratches called swirl marks. Over time, this damage builds and eventually results in your paint becoming dull and the scratches become easily noticeable.
For quickness, at this time of year, I use the DIY car washes places, mainly because I can jet wash underneath the arches. Also, we are not on mains water, so have to watch how much we use.
Hand washed car places are OK and fairly thorough. Not so good with wheel trims. I've used our local one a few times but there's always a queue.