Wax on a wheel just doesn't really cut it. Most contain oils as it is, so it adds to retaining brake dust, dirt etc. Besides, wheels WILL get hot with brake use then cool as you drive. One day if you have a laser temp probe, run you car as you do normally, then get out and shoot the wheel and see for yourself how hot it is. No wax will really do any good, but some say it's better than nothing. I disagree due to the wax when it heats up, relases more oils and just every type of dust sticks like flypaper.
It's the same for tree pollen. Try getting pollen of a waxed car in the sun as opposed to one that has a sealant on it. Big difference.
Any good sealant will work. Some are more reflective than others and were designed for different applications. Rejex comes to mind as it was used for air industry to keep the jet fuel from destroying the fans, now people use it on their finish... go figure, but for wheels, it's a good choice.
Cleaning wheels treat just as your paint, always start mild first and work up. Most wheels are coated now to avoid pitting. Most car soaps do the job with the right mitts, brushes and if this is not enough and you want something just for the wheels, start with the P21S wheel cleaner.
Even if you do not have to wash you car, wash the wheels as often as you can, just make sure everything is cool first.. duh. before flooding with cleaner or water.
Lucky for me I have ceramic rotors and pads so I only worry about road dirt, but that too can be a PITA if the wheel was not treated with a sealant. I use whatever sealant leftover for the wheels. Right now I have a whole gallon of Meguiars sealant for this.
Just use the right brushes as well, some can scratch if they use metal posts to hold the brissles or use a very hard plastic. Always check the brushes, spread them to see if there is anything that can damage your wheel. Some are just foam on a stick and use foams ranging from soft to what a cutting pad whould use.
Best way is a full off removal of the wheel from the vehicle to properly clean and treat them. Just be safe in using any jack, jack stand or ramps.
Regards,
Deanski