I'd agree with RichieST.
I had a spare set of wheels that I bought for winter tyres and they were really tatty, so I just did a rough rub-down and rattle-can job.
The end result was "acceptable" for winter use when covered in road grime but I spent a significant proportion on materials of what having a professional job done would have been.

I have seen DIY jobs that were excellent but they involved a lot of time and effort.