Hi mrbroons.. I query ur description..it's matt black not grey ..however u can use Armour All .. either satin or matt .. you've got quite a collection of colour storms .. especially the papaya orange ..I've never seen one .. I think I would be tempted to add to my collection..Does anyone have any tips for cleaning the matt grey parts of a CS? I haven them back to blacked a lot but that leaves them glossy.
I tend to default to Autoglym bumper care. It is a green gel which applies and buffs easily. Coverage is great and it leaves a nice uniform finish which isn't glossy. Durability is my only gripe - a few months at best.
I can't recommend Autosmart Finish highly enough for black plastics - both interior and exterior. The only downside is you'll need to find an Autosmart franchise in your area and it can only be bought in 5 litre containers.
Over the past 20+ years I've tried most products for dressing plastics from readily available Autoglym bumper care through to more obscure Black Wow with most other brands tried inbetween (Dodo Juice, Zymol etc.) and I've never found anything as good as Autosmart Finish.
Jeff