Sometimes I think some products are utterly unnecessary unless you are actually planning on preping your car for some kind of show...
The image below is of the wheels that were on my last car, standard TSW Apex alloys. At the point the picture was taken they had been on the car for at least 4 years, whatever the weather or conditions. All they ever had applied was a bit of elbow grease and car body polish!
The eagle eyed will notice I missed a tiny bit though, which was at the top of the wheel when the car was in the wash bay. I'm not that obsessive to start faffing around with it as I only noticed once I'd polished the car!