2001 M 146,000 milesLast Sunday decided to clean engine. Used household enviormentally safe cleaner "Sun and Earth". Sprayed on cold engine, let it sit 3-4 minutes gently rinsed with garden hose. Did a great job. Started car and let it warm up about 15 minutes. Everything appeared to be pristine.Monday out the blue my shifter cables started getting a really funky feel. Did not get to the point of needing two hands to shift but really had to work shifter to get into gear, park, reverese. Order cable and dealer installed. Shifts absolutely with one finger now.I don't know if engine wash had anything to do with this or if it was coming. BIG difference between new cable and feel just before I thought shifts were getting funky. I guess I'm wondering if cleaner might have slid down side of engine and got into shift levers/forks or cable???? Or like I said was it just time?? Actually if I knew a new cable would shift like this I would have done it soomer.