What is best way to clean plastic panels?

I assume stread = streak I trial test for permanency of any labelling with methylated spirits and then clean over with meths on a cotton wool ball. When dry I use standard furniture polish , tiny amount squirted onto a cotton wool ball and polish out until no smearing remains

There are cleaners specifically for plastic. Novus is one. It comes in three grades.

What was it last time? What made it turn black?

Most of the plastic polish compounds available are pumice and wax. The pumice acts as a very mild abrasive. The wax hides the scratches and gouges until the wax wears off. Remove the excess with vinegar or 409 cleaner.

Some toothpaste is rather abrasive. Careful what you use. Toothpaste works on (uncoated) glass but not plastic.

Note the you should *NOT* use Armor Etch Cream (hydrofluoric acid) on glass lenses. You will destroy them. On plastics, you can also use automotive plastic headlight polishing compound, CD/DVD repair kit, or just plain automobile or furniture wax to fill in the cracks.

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Thank you. The cover is not scratched. Just don't want to scratch it!

Any recommended 'cloth' to use?

Or, paper cloth that won't scratch?

Thank you. Alcohol hazes, but methylated spirits won't?

Have you ever used Novus plastic polish? The antique radio guys love it.

Thank you. Alcohol hazes, but methylated spirits won't?

You can't remove the scratches without abrasion -- you are "abrading" the rest of the surface to lower it to the level of the scratches. How else are you going to "remove" them?.

Trust me, the Novus products, when used correctly, "remove" the scratches without messing up the rest of the surface.

AND PLEASE LEARN TO WRITE COHERENT SENTENCES AND PUNCTUATE!