Can't be any harder to keep clean than the bloody car itself :d
Truck they are 16" TSW Pace with 195 45 R16 tyres. All the spigot rings etc came with the wheels, simply a matter of taking one off popping the other on. No mods needed
I think they look very good and I'm sure you will look after them, give them a good polish and buff up with whatever car polish you use after they are clean and dry and you should have less of a problem getting the brake dust off.
Beware of Kerbs. :d