Hi, there is a product called anti static cleaner for plastic, that is used in the car repaint trade. Its not cheap & only available in litres. However, if you have a body shop near you, a donation to their beer fund may well secure you a small amount. Alternatively body shops also have a water based panel wipe which will help reduce static if you cant find any anti static cleaner. You may also find distilled water may have the same effect, but it only works with certain types of plastic. With all products, use a lint free cloth to wipe it on, then buff it off until dry. The harder you rub the more static will build up, so be gentle. You can check for static by passing your fore arm over the subject. if static is present you will feel the hairs on your arm stand up a little.
Cheers Glenn