This is a new knock sensor with probably less then a thousand miles on it.
As for cleaning them, I will try that if the rest of this doesn't work. The only thing I didn't understand is when you said 'compress them and put them back in'. What do you mean by compress them? Thanks again!
I am pretty sure he means to compress them so all of the kerosene it out of them. You dont want to put them in filled with fluid. Correct me if I am wrong though.