I live in Alaska now, so of course I have had an intense crash course in bug spray!
You've already told most of the points I'll reiterate, so they are:
- Most brands don't map to ingredients. So there's Off with DEET and Off without DEET (dunno what they use). Cutters with DEET and Cutters with Picaridin (getting back to that in a bit).
- DEET is a solvent. A really really nasty one. Apart from anything else -- I don't think harm to humans (compared to the harm you can take from insect bites, and again, I'm in Alaska...) is proven that well, and even if it is, I'm willing to take the risk. I am however not willing to have my gear dissolved!
- I've been going fishing a lot this summer, sometimes in places thick with hungry mosquitoes. So here's my approach: Before going out spray those parts that will not touch anything else -- top of your head, legs from the knee down, back of the neck and shoulders, upper arms, chest -- with DEET-containing bug spray. You don't need anything like 100%. 20% OFF is fine. Then take a bottle of bug spray containing Picaridin. It'll work ok, keep the bugs mostly at bay and massively reduce the number of bites you get, but will have to be renewed every 30-60 min or so. Use that for hands, face, exposed flesh. I haven't found anything that works as well as Picaridin, except for DEET. Also, have a small bottle of Cutters (with Picaridin) in your pack at all times.
- Wear a hat or cap. Spray it.
- This doesn't cover ticks, sorry (we don't have them here, and I'm not up with that).
- One of the greatest investments I made was in a Buff neck scarf with Insect Shield built-in. It worked GREAT... for the parts covered, that is, my neck and ears.
- For road biking, you usually don't need it. For mountain biking, you do. I've had swarms of mosquitoes come down on me, even get into my helmet and bite my scalp to pieces, at a wooded stop or when breaking down on a mountain bike trail.
Here's a photo of me on a windy day in July on the Arctic North Slope:
Chris - formerly of Heidelberg, Paris and London, now of Fairbanks, Alaska
2011 Kona Sutra 49cm - Selle Italia Diva
2009 Specialized Rockhopper Comp Disk 15" - Specialized XC Body Geometry, 143mm