I have the same type rims (painted clear coat over metal), and here's my approach:
1. I take my wheels off the car every few months (twice a year at the least) and thoroughly clean them with whatever car wash soap I happen to be using at the time. The tires are also scrubbed well to remove any grime or other material which could affect remaining steps.
2. Dry them with MF towels and dry the tires with terry towels (so no water run-off from tires interferes with remaining steps).
3a. I use a polish to prepare the surface, and I follow it up with one of the finishing paint sealants I have on the shelf. The last couple of times I have done this, I used the Mother’s Step 1 polish and 3M’s Perfect-It synthetic wax for this step.
3b. Sometimes I don’t want to split this step up into two separate tasks, so I will use a good wax/sealant with some cleaners in it. I have used Meguiar’s AIO Cleaner Wax in the past here, and I was satisfied with the results. But I never tested the longevity of it, as I suspected it would not hold up well for long.
The last two times I have done this step with an AIO-type product, I used Mother’s Reflections Synthetic Wax. I was very pleased with the results of this product, and I have seen very good longevity from it.
4. (This is really the key step to making my method work I believe.) Any time I wash the car and give the wheels a good cleaning as well (meaning there is no grime, brake dust, etc. on them when done), I use a good Wax-As-U-Dry spray wax on the wet wheels and then dry with a MF towel.
I have used many different kinds of spray waxes on this step, and they all worked great – they helped maintain the wax protection on the clear coat and made cleaning them up very easy. Some examples I have used and really liked are Mothers FX spray wax, Eagle 1 Wax-As-U-Dry spray wax, Lucas spray wax, and Meguiar’s Wax-As-U-Dry spray wax.
Now, I have no doubt that there are many products out there that are superior to the OTC ones I have been using. But I have not had reason (yet) to abandon any of the OTC stuff and go looking for a higher-quality replacement.
So I will continue on with this until I’m not satisfied it is doing what I intend for it to do…which is to protect my wheels’ finishes, make it easier to clean them when washing car, keep them looking [censored] good when all cleaned up.
Good luck!
Nuke