I re-used my clay on a newly wax car ( 1 week old wax). I washed the car carefully and use the clay. I ran into a problem. The clay sticked and left a "clay mark" on the paint. I tried to describe the best as I can. The clay was not dirty. Again, it didn't leave scratch. It left a "white clay mark" on the paint. Did anyone see this problem before? Do I have to throw it away? I didn't have chance to try it on a different car. I used this clay on the same car before before it was waxed with no problem. BTW, I used AIO, SG, and S100 on the car. I will buy a new clay and try it on the car.