Bought a large bottle of 303 and was put off by the instructions. But other members convinced me so I spent about 2 hours yesterday doing all the inside and the outside plastic, with help from the hausfrau.
Wonderful! The secret is to spray the 303 on a microfibre cloth, then rub it over the plastic surface, and finally buffer it with a dry mf cloth. A little goes a long way. Indeed, I think the $23 bottle I bought is a lifetime supply.