Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not so useful for hobbyist

This stuff is just plain noxious. You can't use it in the house. I used it outside on the porch, spraying a tiny bit on a PEC Pad and wiping the slide. Some of the older (ca. 1963 Kodachrome) slides were damaged by the fluid. It worked well on newer slides. The best results were obtained when slides were so dirty that they were basically unusable any other way. Some had mildew on them and this cleaned them up pretty well. It also removes gummy deposits well. In most cases, just blowing dust off the tray-mounted slides using canned air, them blowing off the scanner platten glass and immediately scanning, was the best way to get clean scans. Also, light brushing with a lens brush can be helpful, as well as light rubbing with a PEC Pad. Using this photographic emulsion spray is definitely a last resort. After scanning several thousand slides, I still have most of the bottle left.