Matt black will stain, and eventually turn white! If you want a non gloss finish to your car, you need to go for a semi matt black, that is somewhere between a satin, and matt finish.
Matt paint is normal topcoat paint (non metallic) that has a chalk substrate added, the more you put in, the more matt the paint will go, till you eventually end up with a finish that resembles a black board. Years ago, Ford XRs had their door frames painted semi matt black, this was generally known as an "Eggshell finish"...matt, but not too matt, and no real cleaning problems...
If your golf still has its origional slam/headlamp panel fitted, that's what you should be aiming for!
Tom