Ok guys here is a tip for restoring faded black plastic trim whether its on your bike or car, don't bother with expensive back to black spray instead use smooth peanut butter don't laugh it works try it, just rub on sparingly and then wipe off. If you like peanut butter its a win win use on your sandwiches and your bike, mmmmmmmmmmmmm
I've always used a steady hand and a black indelible marker pen and once dry, have gone over lightly with cheap furniture spray polish. It works well but is not exactly an invisible fix if scrutinised up close. I've now just had a fairing respray (looks great) but the marker pen was a good fix for years. I tried a paint pen but that was a nightmare. Good luck and i hope, whatever you do, it looks better and you're happy. Best regards...icey