i did use an insect repellant with deet, but you're only supposed to put it on exposed skin.
while in kenya, i always covered my arms (3/4), my legs (pants), and my feet (no sandals). the only part that i had deet on, then, was my neck, forearms, and hands. i actually went through a morning ritual that went thus:
shower and then use lemongrass infused massage oil. let that soak in, get dressed, and use DEET insect repellant (lotion form) on hands, forearms, and neck.
my sunscreen and primary insect repellant was staying covered up (as i said, i dressed conservatively). Also, after i washed my clothes, i used a water-spray of lemongrass water on the clothes.
like i said, not one insect bite or sunburn the whole trip.