There are lots of other options that all work sometimes. Avon's Skin So Soft works for some folks, as do daily vitamin B pills.

I have been there too many times to count and think the best bet is to leave NO skin exposed and to wear a bug net over your head.

Even when the repellents work, the bugs can drive you nuts by constantly hovering around your head. Last week on Kodiak Island the bugs were so thick we all inhaled some and got them in our eyes. They were even a nuisance 1/2 mile off shore.
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No huevos no pollo.