Thanks for the advice, I don't work again until tuesday, but I think the MF towels we are using are pretty cheap ones. They seem to be lint free but I will take a look at the info on them and get back to you. I'm thinking if we get some good glass ones like the weave ones and just use them for windows that will correct the problem. We have been drying them on high heat so maybe that was ruining them, I just read to dry them on a low heat or no heat at all. Then again on the car that was giving us trouble we were using towels straight out of the packaging (maybe they needed to be washed first). I was using a little cleaner and an older MF first and then following up with a brand new mf... seemed to just move around the streaks, was very strange. I can usually get the windows perfect, it was just a few cars that had this problem. Hopefully the new weave towels will help, thanks again for your input.