The alloy wheels on my 2005 GS300 had become corroded, and were flaking. I had them refurbished at Autowheels in Colehill (near Wimborne, Dorset). They had the car for a few days in which time they removed the wheels, removed the tyres, acid dipped the wheels, buffed and grind-ed the "kerbing", then powder coated the wheels, and finally balanced and refitted the tyres. I took the opportunity to change from silver wheels to grey graphite (just for a change). The cost was £300 cash (£85 per wheel), no vat.
I'm extremely pleased with the results, and with the price.
I've attached a photo of the finished job.