Meguiar's Wheel Brightener - unlike all the others that just claim to do so, it's a product you can spray on, leave for a minute and then rinse off, leaving your wheels clean.
BUT...
Despite the faint blackcurrant smell and charming purple colour, it's aggressive as hell, comes with a warning list as long as your arm about what it can do to you if you so much as look at it and it's not a good product for using all the time as it will start to cause damage to the wheels over time.
So once I've got the wheels clean with Wheel Brightener, thoroughly rinsed it back off again and made sure they're dry, I use Poorboy's Wheel Sealant to keep things protected. Next time around, 99% of the muck comes off with the hose and a quick wipe with a microfibre cloth gets everything looking spot on again.