All depends on how bad the white is . . . With white cars, especially if your running it all year round, it picks up dirt and seems to hold it...If its like yellow, the best thing to do is get some G3 and a buffer. . . And spend at least a whole afternoon on it - afterwards i'd use G10 to buff it up - Then some general polish - or colour re-storer to polish it up and gain a shine . . . Myself - I make sure my car is clean all the time, and i also have a garage to keep it in over night - So about every 2 weeks to make sure the grime is off it i go over it with G10, but polish it every weekend. Chris