Virtually all the lens polishing kits I have seen come with a protective clear coat that you are suppose to apply after polishing and then renew every so often.
Like you I have a MK2 and I used a standard headlight polishing kit to fix it. Not a showroom finish but I got allot of improvement. The trick is to be methodical and make sure you sand thoroughly with each pad.
It is exposure to UV which clouds the plastic, so even if doesn't have a protective coat as new, it is sensible to apply one after polishing.
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