Hi Ron. thank you but I got it sorted.
I cleaned it using the dishwasher, but turns out it didn't clean It that well.
I put some thinners into a bucket and proceeded to clean with a petrol washing brush which did the job well.
I almost melted the end of the grill that was sitting in the thinners, but realised in time.
I sprayed it in a black which seems to be a satin , not glossy , not flat. The can just said acrylic enamel.
Anyway I sprayed the grill (all three pieces) all black, so now I have to paint the silver edges.
What would be the easiest way do you think? I thought of painting some cardboard in the silver and "running" the
grill face over it, once or twice.
The other thought was to use a cotton bud dipped in silver paint and rolling it along the edges?