In Reply to: New Owner (Plastic window) posted by Stephen (CA_ on February 11, 2000 at 20:09:32:
The window folds in half when the top goes down, so a glass window would last an even shorter tiome than the plastic.
There are some things you can do to preserve the window. The first is KEEP IT CLEAN! Dirt scratches the soft plastic and when folded the outer (dirty) surfaces lie against one another. Use liberal amouts of top cleaner and water on the whole top (including the window) when ytou wash yyour car. This is the only way to get dirt off without scratching. I have used both Zymol's and BMW's cleaner and protector for my window and am satisfied with bith products. I have heard that Auto-sol makes the stuff for BMW, so you may be able to get the same stuff withgout the BMW price.
You car should have come wiht a window blanket (if it didn't creative whining will usually spring one loose from the dealer). USE IT when ever you put the top down. I would also invest in a window pillow. The Z3 window can crease and buckle when the top is down. A blanket supports the window and aloows a more gnetle curvature when down. It also prexvents it from kinking in the centwer, which can craze the clear plastic.
Finally, the top shopuld only be down when you are there to enjoy it. Keep the top up unless you are using the car. I have a 1996 Z3 and my top is clean and the window clear, so I seem to have mastered this.