I'm a big fan of Optimum Products. It simply just works and trust the science. After watching some internet reviews, I decided to buy the big red sponge as a method to reduce the microfiber towels I have to use and speed up the washing process. I've presoak the panel with ONR W&S first and then run the sponge across the panels. In my findings, even doing the panel with many additional passes, I'm still seeing dirt being picked up by the waffle weave while drying. Is anyone experiencing the same symptoms or am I doing something wrong?