Hair de-tangling

[aaakker]

Hi, I need some help with the following: I have a friend with Indian heritage that for various reasons kept her hair in a bun for months. As a result her hair is completely tangled together and in need of detangling by somebody that knows what he/she is doing.

Does anybody know of a barbershop that does detangling? Perhaps an African barber that has experience with detangling dreadlocks. Any help would be greatly appreciated.