Fantastic. So glad you're enjoying it. They're great cars, looking forward to mine now after reading that. If only SWMBO looked after hers as much as you, hers is a right tip inside, with glitter, sand and nail varnish everywhere
Regarding the C5, I swap my wheels between summer and winter on my Disco each year and give them a coat front and back, it makes the rears of the wheels so much easier to clean between wheel changes, no need for ironx or anything else, just a bit of good shampoo and they're gleaming.
For the front of the wheels, in between wheel changes I top with poorboys wheel sealant. The brake dust still builds up, but, makes it a doddle to clean.