Sorry Tony - dont know how I missed this post!

As pointed out, it really depends on what you are hoping for.
Its the type of job that I dont fancy doing often, so I prefer to do it right, once!
As the wheels will be going on, its best to do a full decontamination (assuming they are not brand new), a wipedown (even if they are new) and apply something like CarPro DLUX, so once the job is done, its done for 12 months or more. Cleaning the wheels after that, will be a doddle!