I would recommend a Power Stick and Green Wheel Cleaner from Adam's. That's if they are pretty caked on with crap and brakedust. Once you get the majority of that crap off, you can treat them like the rest of your paint. Adam's Car Shampoo works wonders on those wheels.
Like others have suggested soap and water is all you need for basic maintenance, if you need something to help cut thru more substantial brake dust buildup our green wheel cleaner is the way to go.
As far as polishing the OEM wheels are actually a clear coat paint finish, not polished aluminum. So if you have any defects or hazing you would polish them with the same products used to correct any other painted panel on your TBSS.
I'd also recommend that you wax or seal your wheels regularly. A good coat of wax or sealant will help protect them and by reducing surface tension make them easier to clean.