deptotpr

I was browsing for a cleaner for my back plastic window, and look what I found.

http://www.plexusplasticcleaner.com/auto.html

VGM911

+1

Landjet

Been using this stuff for years and it also works wonders on my lexan windows in the race car. Best product I have found.

98Boxster

I use a damp microfiber rag, followed quickly up by a clean dry one.

JMITCH

I have also been using it for years. My 01 Boxster's rear window still looks great. I apply the Plexus cleaner monthly with a clean microfiber towel. If your window is too scratched there is another product called Novis Plastic Polish that also works well. They have multiple levels of abbrasiveness although you might only need level 1 or 2.

mikefocke

Novus has #1, #2 and #3. Going from polish through mildly abrasive to highly abrasive. If the window is yellowed and cloudy, used #3, then #2 and then #1. If just slightly rough in feel, use #2 and then #1. Used them on mine and they kept the plastic clear and supple for about 8 years. They are sometimes available in a kit.

perfectlap

you should probably use an old t-shirt instead. MF is generally not used on glass and clear plastic, unless it is a special mf made for that purpose.
Most inexpensive MF is for janitorial use which is too aggresive.

Personally, I don't even trust most autostore mf packs for paint either.
It's overkill for a well mainatined surface. A buffing towel is best.