What are you using to clean plasma screen?

Well, I finally did it, I ordered the last of the best plasma out there this week, Pioneer Elite! So, I am doing some digging here and was wondering what folks are using to clean the screen. The salesperson was trying to sell me the AudioQuest Cleaner for $19 - I told him I will hold off... He was also offereing warranty to me for $500 for 5 years, parts/labor/replacement and if I don't use the warranty in five years, they will give me $250 store credits - Should I or Shouldn't I? The Elite already comes with a 2 years warranty...

Your Help would be greatly appreciated!