Rough trade, or homework for the UV enthusiast
A Nikon Series E lens has a simplified lens coating, but will yield much better results for UV if you remove the coating. An old T-shirt, plenty of abrasive polishing cream, and infinite patience, are all you need for this intrepid task. Put your favourite CD on the stereo and grind way. Ensure you have actived "repeat" mode on the player simultaneously. At least you'll realise just how hard and scratch-resistant lens coatings are.
For UV-enthusiasts without the patience, an electric drill can speed up the polishing task immensely.