Most options that I am offering are expensive at first but will work
For the cowling and the roof line trim, I use Milestone Lemon Proof, Driven Multi or Optimum power clean first with a small stiff brush. then I follow with Glare Zero by hand with foam pads which is a deoxidiser and purifier for many surfaces including paint
It sucks out impurities as well as reviving the like new finish on most ext trim.
The foam pad may turn black as you use it, thats all the carbon and damage being removed
From that point, proceed with Gtechniq C4 or an American or Japanese glass/quartz coating product or Optimum Opti Coat (Cquartz is another)
Any materials that are hard but smooth I actually polish by hand or machine (depending on shape of the trim) with Glare Micro, Infinity and Advanced to give a gloss black paint like finish permanently.
However textured trims and cowlings do not like that stuff. wrong material
Zero is extremely versatile ( I use on tyres, trims, paint, plastic chrome, wheels and interior rubber seals and plastic) but its only downside is its a couple hundred dollars a litre and smells like paint. it will not damage any surface though.
when it comes to exterior trim repair, Zero after a degreaser or APC is dynamite preparation for a permanent coating system.
I highly recommend it for those with exterior trim problems. forget dressings and dye's, clean it, zero it then coat the bastards.
Glare :: Home
you can do the wiper arms with glare and top with Gtechniq C4 for a permanent paint like gloss if you wish.