I have to add that the soft scrub will also remove surface dirt, rust from the tail clamp, will help work out tail rust chunks and remove the stain if used with tooth brush, and kills germs and bacteria because it contains bleach. Negative aspect of it is that you need to very gentle with it on glitter symbols because it will remove some of the glitter if you scrub too vigorously.
*edit - I have tried paint thinner and found it to be not as effective as acetone in removing marks. G1s will also swell up if you soak them in it. (like if you're trying to remove a botched FBR) The same will happen with acetone for that matter. But, if left to sit for a long time, they will return to their normal size and shape, but with a slight difference to the surface texture of the plastic.