I have never seen anyone post a message about having ruined their headlight lenses by cleaning them. There are at least 4 or 5 different products you can use, and a few diff. methods that have been posted here before on how to clean them.
If you want brighter lights, you can buy brighter (higher wattage) bulbs, but you may have to upgrade the wiring. Too much wattage, and you could burn out the headlight switch and/or start a fire in the wiring.
You can also install the 97 headlights (clear lenses), but then you have to install a 97 hood (or live with the gap), and other misc. parts.
If you decide to do some of this yourself, search thru the forums, and you should find all the specifics you need.............
Hope this helps....................