This is a word of warning to anyone with an older model NSX, especially if you just bought it and haven't been told: if your engine cover is in good shape, DON’T TOUCH THE FUZZ! You can just assume that over time, heat has broken down the adhesives and if you touch the fuzz in the middle of the cover(where it stays hotter), it will come off and leave an unsightly bald spot. If you try to vacuum the cover, the fuzz will come off.
The same EXACT thing happened to me, only I had additional help from the guys at the garage putting auto parts on it. It’s the only ugly part of my car. I’ve thought about it for awhile and have considered the following fixes aside from shelling out for an expensive new one:
1. Buy a used one: lots of guys are lightening their cars. You see them selling engine covers in the $125 range occasionally here and on eBay.
2. Finding some way of stripping the cover (heat gun? Paint stripper? Belt sander? Scraper? Pressure washer or sand blaster?) and then either covering it with some sort of fabric, painting, or buying one of those “Flocking” kits from Woodcraft to put the fuzz back on.
3. Take the opportunity to go light and get another kind of engine cover. I’m really liking the mesh ones.
4. Go without an engine cover.
Surely someone has successfully grappled with the refinishing problem a long time ago, though I haven’t seen anything useful in searching.
The lint roller is the best idea I've heard yet as a way clean safely.