I couldn't agree more -- I sometimes rent Hertz cars that just have filthy inside glass. It's a particular problem if a car's been smoked in. And some of the worst offenders are brand new cars -- some Hertz stations seem to think that cars come perfectly clean from the factory, and that's not the case at all (if you can still see the assembly line suction cup marks on the windshield, it means it hasn't been cleaned properly).