Someone decided to put dirt inside the727 and it's on everything most internal parts have some sort of dirt on them. How can I clean this dirt off? Can it be hot tanked like a engine?

Loose dirt? Caked on crusty baked on dirt? Are you rebuilding the transmission (a very good idea if it has had dirt in it)?

A rebuild will have you disassembling everything anyway. Put the parts in a parts washer or scrub them with brake cleaner and a scrub brush if they are really dirty. The case can be pressure washed while it is empty.

loose dirt and yes its going to be rebuilt. well it already was just was leaking fluid from a hole in the cooler line and I thought it was the shift shaft seal. so I want to clean it and re assemble might save money as apposed to buying 1.