My wipers were fine before Carlack so I would think they are not the prob.
Guy : Not sure, I might have put too much on ? Might be put too little on ? I'm not sure. All it said in the instructions was to apply it with a paper towel, so thats what I did. I'm pretty sure I removed it all, all I had to go on to judge that was the window becoming crystal clear again and thats what I waited to see while buffing it off. Good shout on contacting the vendor/carlack, it wont do any harm.