I have a few MF towels that are brand new that I used to remove NXT paste wax from my car. I have used these towels on two different occassions to remove NXT. I applied too much NXT to the car, and now certain spots of my towels are caked with wax. I have machine washed them a few times with warm water and Tide liquid detergent. This has not done the trick. Are there any other solutions? The waxed spots are kind of rough, but I tested them on a CD and they didn't scratch the CD, so they should be safe on my paint?