After GerTruDe's second bath..... anyone got a trick to keeping those black shadow wheels clean? 
It is just not possible to stop them getting dirty.
How much time/money do you want to spend?
Quick - keep a microfibre cloth in a plastic bag in the boot and just give them a wipe. Spray the cloth with some quick detailer if you have it.
Too much time on your hands - wash -> dry -> alloy wheel cleaner -> polish -> seal -> tyre shine. Of course this means they wont dirty as fast and it then makes the quick clean really easy.
You only need to use the alloy wheel cleaner if normal washing does not remove the break dust. Make sure your polish won't whiten the tyre walls. And I prefer to apply the tyre shine by spraying it on a cloth first. Some use tyre shine gel.
Ask in the detailing section and I'm sure someone will have a better way.
