Originally Posted by JamesF
I've used that too, and also found it very effective. The active ingredient is called "DEET", which apparently is quite nasty stuff over long periods in higher concentrations, but safe for short-term use.
As you say, though, it's also quite effective as a human repellent. Smells like an industrial cleaning fluid that's described only somewhat accurately as "lemon".
I use this regularly. It may explain something. It certainly repels most lifeforms. It comes in various strengths. 50% DEET is the max that should be applied to bare skin. 100% is meant to be sprayed onto fabrics like hats, wrist bands etc. All DEET melts plastics like sunglasses, car dashboards, rucksacks etc.
For light midge incursions, I use AUTAN in pump spray and stick application. OK for marginal infestations, but DEET is your only man for the bad days. When they're very bad, a hatnet is the only way. The bodies just pile up on the DEET, like zombies in World War Z.