All I know is that some people do this often, there is no risk I think. In some French forums, it's the most used washing method.
People who's hair do not like protein should not do it, since egg has both proteins and lipids
Always rinse with COLD water, and A LOT, because the egg yolk can cook and be solid and make a mess if warm water is used...
Have fun experimenting and tell us how it goes (:
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