I saw that and even posted my question there as well. Never got an answer. My question was more for brand new rims, not cleaning and protecting used rims.
Yep, wax will help a lot but the lower the grade of aluminum, the quicker it will lose it's shine but being softer, it will polish back up easier. There is actually a product specifically for wheels called Wheel Wax that works really well.
Washing very regularly with gentle car wash soap and a fuzzy micro-fiber mitt that is rinsed and washed regularly and not mixed with car wash water helps a lot too. The wash as you dry wax spritz when you dry them off will help keep them slick as a compliment to a regular waxing every couple months. Just like car detailing, your time commitment just depends on how anal you are.