Yea, mine was also a daily until I saw how it got new marks and small scratches onto the paintjob every month or so. So I decided to make it a weekender. Managed to remove most of the scratches with car polish as they were only surface scratches.
I try and wash as little as possible. Rather drive with a layer of dust than wash because I noticed some rust spots appearing.
Not big, very small.
Example the following places:
When opening the boot, all around the outside where the seams are welded together there are little bit of rust appearing.
The seams that are on each side between the bootlid and the back window. They fill them up as I understand with liquid lead.
Well, mine is make hairline rust here.
And then hairline rust marks in the water channel that are running on each side of the roof.
That's about it that I can remember.
It is mostly on the seams. Polish them often to prevent them from growing bigger.Looks like it helps.