A solar cooker can reach up to 150 degrees Celsius(300 degrees F). UV from
the sun will kill bacteria as well -- if the milk is shallow enough for the
UV to penetrate. Milk in a plastic bottle in the sun would get very hot --
just like leaving a kid in the car.

The problem with these methods would be that over-heating can destroy many
nutrients, destroy flavor, and cause curdling. The light would destroy
certain nutrients as well and oxidize vitamins C and E and such causing
dangerous free-radical development -- and especially oxidizing lipids to
cause carcinogenous rancidity.

If attempting to pasteurize donor milk in such a fashion, it would be best
to protect the milk from direct light exposure and have a good idea of the
temperature. Heating the water before adding formula would be very
preferable, I imagine.

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