I used brasso on mine and it came up really clear although with all the heavy handling the stitching I was un aware was going rotten and the screen came adrift so all the effort was wasted so I found a glass screen and fitted that instead.
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MEK will do the plastic no end of no good, don't do it! Very mild abrasive, for example Farecla g3, is probably the best thing for the plastic, as it contains no ammonia nor heavy petrol solvents. It will leave white marks on the cloth so cover the edges of that with neat fairy liquid before starting. UV damage makes the plastic brittle so it takes care to get it right. Armorall is often pretty good at restoring a bit of flexibility and transparency to plastics and will not harm the hood fabric. Clean that by scrubbing with a shoebrush using neat Lidl baby shampoo. Rinse that off and when it is completely Gobi Desert dry again, re proof the top with Fabsil.