A subject dear to my heart 😬. With a bit of work you can get a near mirror finish but you need to use gradually less coarse polishes to achieve this. Personally I used Autosol (in a tube), then Autoglym (in a bottle) and finally Peek (the foam version in an aerosol type can). A lot of people recommend Mothers Mag but having tried it I don't rate it. Having got a good finish you will find that it dulls even when you don't take the car out - presumably due to surface oxidation - but this is easy to polish off again.
I have tried protecting the surface using wax polish - this does prevent the oxidation, but the polish tends to dull the mirror finish anyway so I prefer not to use it. I might feel differently if it wasn't for the fact that the se7en only comes out when the roads are dry!
Rain doesn't really mark very much - even if you do get marks, they are easily polished off again. I rarely wash my se7en - twice in 18 months I think - so you definitely don't need to wash & rinse (the se7en) after every trip.
The biggest pain are stone marks which tend to accumulate dirt, polish and cr*p and look like small black marks unless you polish hard. I guess there will eventually be enough of these that the whole car will look cr*ap, but since polished ali looks sooooo much better than any paint finish, it will still look better than all the painted cars (although the one on the cover of the latest LF looks cool)
SV 52 CAT - moles fly -