I use a micro-fibre camera lense cleaner for my facia panel. These I buy locally at the camera shop. There is also a much larger version which has just appeared for cleaning windows which are actually cheaper and work just as well. These are 80% Polyester/20% Polyamid and both work very well.

If you have scratched your facia, the best solution I have found to date is (don't laugh) - children's toothpaste! If you use a small amount with a moist COTTON cloth, you can polish out surface scratches. Be warned, it can take some effort, and it won't do much with really deep scratches. I would advise you test a small area of the screen FIRST before diving in head first, just to be sure. I use this to polish my motorcycle helmet visors, where scratches generate glare, and it helps a lot. YMMV.

One of the few remaining Mk1 owners... #00015