Originally posted by stevebrot John...I am glad you you have had good luck with this product, but while Goo Gone has citrus components, it is hardly citrus-based. My bottle is clearly labeled as containing petroleum distillates (up to 95% according to the MSDS*), is highly flammable, and its contents are not miscible in water (again, according to the MSDS*). It is great stuff and may work well with the glass focus screens found in true vintage gear, but I would hesitate to use it on the plastic screens found in most cameras made since the mid-1970s.
Your comment makes a very good point in that screens are best cleaned outside the camera. For an ME Super, this requires at least partial dis-assembly (top cover and pentaprism). That is why I send mine to a pro to resolve a gooey screen.
Steve
* Link to Goo Gone MSDS (Material Safety Data Sheet) may be found
HERE I haven't used this with any screens other than the modern ones which I had no clue as to what material they are other than being fresnel lenses. In any case, I haven't experienced any ill effects to soaking my lenses in them though I wouldn't rule out the possibility that it could damage a screen either as I'm sure they vary greatly. That being said, I've had good success with this product on a host of other materials as well(glasses, protective screens, LCD screen) <- we have children
and so it does seems to be fairly good in that respect. Though I always wash off any remaining residue after use. Just to be safe.
At any rate, I certainly wouldn't use it everywhere either. As I'm sure that whatever it does to break down bonds and adhesives would apply to a host of other materials as well. And so there's always a risk.
Perhaps someone with an older screen could run some tests?