Cleaning Spider wheels

Don't know why, but really struggling to keep the wheels on the Spider clean........

Normally use Auto Glym clean wheels on my cars but this just doesn't seem to be cutting the mustard on the Spider wheels

I read somewhere that the wheels are magnesium ( And the same wheels as on the A610 )

Anyone got any tips on products to use to keep the wheels clean?

Thank you !

definitely not magnesium take one off and feel how heavy they are... just normal alloy, the original finish is satin not super glossy so they are more difficult to keep clean.... or get them refurbished in a gloss finish, plus they will look better too.