I had the installers clean the floor 3 times but they refused to get all the stuff up that they left behind from the installation. Since our closing date was the next day, I decided I'd just clean it. Didn't think it would be that much of a problem but regular cleaning didn't work. I could get the stuff up with my fingernails after soaking it and since that didn't scratch or mar the floor, I figured the plastic pad wouldn't hurt it. I used much more pressure when using my fingernails.
In any case, I'm sure the installer will not help out since he is not happy that I wanted him to clean the floor 3 times in the first place. Thanks for the advice.