What's a good long lasting plastic headlight lens restore 'system' I can get from the local car store?

Also, what's the 2 or 3 best windshield wipers out there?

 

I hope you're aware the XJ headlights are glass? And I've always run rain x wipers. I go through 1 set a year but i know they could last longer

 

If...If..you are talking Polycarbonate light housings, then Dupont Polishing Compound and a high speed polisher. Careful not to press to hard in one area and "burn" the Polycarbonate. Mask off painted or rubber areas with a couple layers of masking tape. Never personally had any luck with the "genie in the bottle" cures for restoration or mechanical issues. Guess the snake oil salesman changed from fixing people to fixing everything on vehicles and motorcycles...

Any good "real rubber" wiper. Make sure that you wipe the blades with a cotton ball with rubbing alcohol every 6 months or so and they will last 3-4 years.

hope this helps..