Apparently not, it made improvements to my brake, hope specifically reccomended this. I have to say it did make a vast improvement. I did however not enjoy cleaning my white rim tape
The grit in the mud takes out some contmination. Then when the mud drys it holds some contamination and when the brake is used this flakes off taking it with it. They did say if the contamination has 'gone through' the pad then the water mud/mud mix would not be of any benifit.