My rear window has a fold mark across the middle and i've tried to clean it off with Meguiars PlastX but the results are barely noticeable.... I'd already tried it from the outside and assumed that the marks must of been on the inside, but the results were no better. Has anybody had good results with this stuff? How long did you rub for? Where can one acquire the services of a midget to get past the headrests and at the inside of the window more easily?