Spyder Rear Window Protector

most just use a micro fiber towel

 

I had the same thing for my Porsche. Window still looked brand new after 11 years!! Did I mention, I HATE plastic windows?

 

I'm not sure a cloth would help much. The plastic rear windows in our 360 or 430 spiders are supposed to bow rearward, not towards the front of the car. Most scratching may occur on the inner surfaces where they may make contact with each other. Those inner surfaces are on the inside surface, not the outside surface, when the window correctly bows rearward. So unless you could fashion a protector to go on the inside of the car and remain in place as the top lowers and folds, I don't see this being very helpful or worth the hassle.

The plastic windows on most other cars do the opposite, and bow towards the front, such that when viewed from the rear, outside the car, the folding plastic window forms a trough or valley. Applying the cloth or protector (as shown on the BMW Z8 above) then works well, but is still a hassle to attach each time you lower the top (or remove it once raised). The same kind of protector could be found on BMWs (before they went to a glass window design).

On the 360/430, as the top folds in the opposite direction, it would appear to be coming towards you, forming a ridge or mountain, not a valley. If it folds the other way, forwards, it will make contact with the folding mechanism and the scratching will show up as a longitudinal bar across the middle of the window. If your window shows that, start ensuring that your window bows instead towards the rear of the car as it folds. You may need to push it towards the back of the car as it folds, until it gets "trained." If you want to remove the scratchy "bar," try Meguiar's Plastic Polish or equivalent, applied to the inside surface (you can apply it to the outside, too, but that scratching is occurring on the inside).