I play the MCC4 Standard Golf Pride grips. I noticed the upper cord part feels slick after about 18 months of playing yet the rubber part feels great still. I was curious if there is something I could apply that would clean up or help with the cord part become somewhat better gripping. I have never cleaned my grips as I have never know what to use so I don't damage them. Only the occasional towel & water. Any suggestions would be great.