Drink as much apple cider vinegar as you can stand mixed in a large glass of water every morning, mosquitoes and other bugs will leave you alone.

Not a repellent, but a home remedy to stop the itching from mosquito bites, recommended to me by an old pharmacist back in the 60's: take cloudy ammonia, mix 50/50 with plain water, apply to bite with cotton ball or tissue until the itching stops. Do not use on broken/bleeding skin. Usually will stop itching for several hours. Reapply as necessary. Always and still works for me. YMMV.

Thanks for the tips

I just got back from a weekend of training. One application of 3M Ultrathon Friday morning. Between 9am and 11pm I received 1 bite on my arm and 5 on the small of my back just above my belt...where I neglected to put any. I didn't think about my shirt coming up (I was on my hands and knees most of the time).

I even mixed it with cream sunscreen yesterday. I was worried one would defeat the other but I had no bites and no burns.

Take that mix, and right before application add a little baking soda. It will pretty much take care of any bite or sting. When I was a lifeguard ammonia and baking soda was my standard cure for kids stung by bees or bitten by flys. Worked well. Stopped the tears and itching quickly.