Here is a little tip that will save you some big $$$. Found this out while doing some consulting work at a huge manufacturing plant.
In this plant it is required that the employees wear safety glasses and as you can imagine these glasses are constantly getting dirty and dusty. They have cleaning stations for their safety glasses where they provide some small paper towel sheets and a cleaning spray.
I noticed that the safety glasses were made of a cheaper, lighter plastic than my own eye glasses (poly carb lenses) and lighter than the plastic on my instrument panel. So the light went off and I thought why not use this same cleaning solution to clean the plastic cluster lenses in my car (and eye glasses btw) after all it was not scratching the safety glasses the guys were wearing. So I tried it and it worked great.
Best part is that a gallon of the stuff runs approx $16 or a 16oz bottle is 4.50. News flash, this is the same stuff lens crafter, sunglass hut type places sell for $5 - $10 for 2-4oz. It comes in both silicone & non-silicone formulas (non would be used in paint shops, clean rooms ect). Oh, and it's made by BAUSCH & LOMB, I think they have a little experience in this field.
I started using the stuff after a ran out of PLEXUS and the silicone formula works and feels a lot like PLEXUS. It also works great on the tinted side of my tinted windows.
If you want to see the stuff try this safety supply company we used to use.
www.northernsafety.com --- the product number is 105-1533 (silicone) & 105-1050 (silicone free).