[goodbyalfa]

My current car is mineral white, which I have found less prone to visual marks.
I spent a day when I bought it on decontamination then coating. To be fair after three years, I was glad I spent the day and around £100 on products.
Now my previous 440i car was mineral grey, and I paid for a full detail and gtechniq ceramic coating from a local detailer. Protected it very well.
Same story with my blue 330 before that.
My take on it is that if it's a dark colour, ceramic will help, however water marks from the high hydrophobic coating can be a pain in the ass...
For pale colours, I do not think I'd bother. For dark colours, overall I'd get it done professionally.