Original Source said:

5th is Meguiars brand Automotive cleaning wax (It's a paste wax & slight compound in a red can). That can be applied by hand with the sponge that comes with it. I do the top AND the 4 sides with it. Rub it in good,(about 5 minutes) then clean off with yet ANOTHER clean, soft rag!! Keep in mind that the more elbow grease that you use in each step, the better the job will come out. You'll never get out the deeper scratches, but depending on how bad it was when you started, it should improve immensely! I've had covers that had become translucent that I was able to bring back to transparent...and shiny, too. The 6th and last step I recommend is to spray the inside with Windex, AND a shot or two of liquid spraywax, letting the two liquids mix together (Pledge or equivelent), use another rag to wipe it all up. Do the same for the outside of the cover when the inside is dry. The reason for the both liquids is that spray wax by itself streaks, and Windex by itself scratches. Put the two together, though, and you get just the positives!

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