I was looking for an alternative to the wasp spray that has harsh chemicals and found this on clearance at a home supply store. The only ingredient is lemongrass oil. Figured it wouldn't work, but for $3 it was worth a try. I used it and was amazed! Way better than anything I had used before, and I even liked the smell; but not by the wasps that were killed on contact. Went back to the store and bought 9 more cans and have been using my supply for years.
Interesting choice... I have 2 concerns:
1. Lemongrass oil is an essential oil. It may etch the lense.
2. Lemongrass oil is an amazing bee attractant. We're at about the end of swarm season, but I wouldn't be surprised to see a swarm of bees on a camera after spraying it. I spilled some Lemongrass oil on a shelf on the back porch and had a bunch of bees settle there...No queen, but I guess it was part of a swarm that got confused and settled there.
Edit to add: beekeeping supply stores even sell lemongrass oil for attracting bees:
Lemongrass essential oil is a surprisingly good swarm lure and has been used successfully for years by beekeepers to attract swarms looking for a new home. The smell of the lemongrass oil mimics the smell of scout bees scenting the location of a new home and helps to draw in more scouts. A...
www.foxhoundbeecompany.com
Though, you get better prices elsewhere. So, it's not just my anecdotal example. It's established that it mimics a bee pheromone.