I just moved into a new house (new for me) and the previous owners of 10 years were heavy smokers. I've got Mr. Clean working for me every evening after work but am concerned about using it on the part of the sash where the window moves up and down. The house was built in 1970 and doesn't seem to have the usual weights and pullies but it sounds more like springs. Don't want to mess up anything by cleaning this part and find out it makes the windows harder to open and close. Any suggestions?