Can I get away with using Propanol/IPA or Acetone for cleaning lenses? I have an old Helios and a couple of newer EF/S canon lenses that are slightly grubby on the surface of the glass. I know you can get 'proper' stuff but I have Propanol and Acetone (and probably CFC/Amberklenze) by the bucket load at work. If I can use either without stripping off coatings it would be nice.