I coated mine with a Nanolex SI Matte ceramic, makes them easy to clean and I always finish them off with Nanolex Matte Final Finish. There are a lot of good products out there, Chemical Guys produce an Aerospace wax coating which gets rave reviews, also available in Matte. It is trial and error until you find a matte product that suits you, I found high gloss detailing products and polishes spoilt the satin wheel finish. It also depends on how much time and money you want to spend looking after you’re forged alloys. A regular wash and cleaning routine with a wax will applied is all that is basically needed, it is up too you if you use Swissvax or the cheaper end of the market products but they will basically do the same job.