No one has a quick and 100% effective neutralizing agent for Capsaicin.

Capsaicin is the chemical agent in peppers (not the seeds) which stimulate tissue and fake the brain into thinking there is pain. No doubt the pain is real though!

Milk, baking soda paste and honey do a good job removing the sting from the fingers and face, but trace amounts of Capsaicin will remain on the fingers even after dozens of hand washings.

Advice from a Bio-Chemist at Michigan State University is to wash the hands in alcohol. Please be aware that this will only help to a certain degree.

Though there is no way of completely neutralizing pepper spray, its effect can be minimized or stopped. So what is the remedy? As veteran chili eaters know, capsaicin is not soluble in water, and even large volumes of water will have little to no effect. It is, however, soluble in fats and oils, so milk or detergents can be used to blunt pepper spray effects and wash it off. North American street medics use a non-toxic eye drop solution of 1:1 water and aluminum hydroxide (Maalox) which helps neutralize pepper spray and relieve symptoms.

Victims should be encouraged to blink vigorously in order to encourage tears, which will help flush the irritant from the eyes. Some of the oil can be washed off the face using a degreasing, non-oily soap such as a mild dish detergent, and a fan will provide some relief.

Some "triple-action" pepper sprays also contain "tear gas" (CS gas), which can be neutralized with sodium metabisulfite (Campden tablets, used in home brewing), though it, too, is fat-soluble and could be washed off to a degree with milk, and some contain a UV "blanketing" dye (little can be done against this, but its effects are not nearly as dramatic).

Ultimately you will need to wait for the skin to slough off the microbes of Capsaicin.