Best Way to Clean White MacBook

I don't know about the keypad or wrist rests, but I use a citrus based product to clean the outside. The polycarbonate shell is pretty tough stuff. Also, I wash my hands before using my Macbook.

A regular household Mr. Clean Magic Clean Eraser has helped me clean my wrist pad/track pad. I recently got pencil lead on it, and used the eraser. Worked good over the wrist pads, and the keyboard. Use sparingly, though.

I use baby wipes. If its good enough for a baby's butt then it surely should be ok for plastic or metal.

You may want to give Apple a call and see if they want to replace the top case:
http://docs.info.apple.com/article.html?artnum=304058

As posted above, the Mr. Clean Magic Eraser works very well on and around the keyboard area. I also wipe over what I have "erased" using a paper towel with a light spray of glass cleaner. I then use the paper towel and glass cleaner on the outer casing and bottom of my MacBook. For the screen I spray a little bit of glass cleaner on the microfiber cloth that was supplied with the MacBook. I do this about once a week and it always looks clean!

I have a white macbook too. Apple sells iKlear cleaner. Turn your macbook off and wait a half hour and clean it. It really works!!!

No need to wait so long before cleaning it. Just DO NOT clean the trackpad. Did that it makes the trackpad unusable for a couple of hours.