The rear cargo "manual" slider windows on my Cruiser appear to have never been used. So, during my cleaning session, I unlocked each of them. Once unlocked, I tried to slide them, but I'm assuming due to age and non-use, it is very difficult to slide either side open... Even once I was able to get the driver's side window slightly open, it was then hard to shut it as well. Do any of you have any tips/tricks for opening/closing stuck or binding windows? Is there a special lube to use so the windows will open/close easier? Is there a certain method of removing them completely to clean out the slider tracks? I just don't want to damage the rubber or seals by trying to force the windows open 100%, or while trying to close them again.