Soldato
Buy it in the 5L size, makes it way cheaper and should last a good while. Also buy a chemical resistant spray bottle to decant it into.I did find I used half a bottle though for one wash but my wheels were in a mess so did them with spray, jet washed and then did a round 2 to get callipers and further into the wheels done. Looked great when done but that first round was what impressed me most, cleared a lot more than the other products I mentioned above.
All you should need to do is give the wheel a decent covering, leave it for a few minutes and then agitate with your wheel brush. You should be able to get into the barrel of the wheel and get the calipers done with just one application.