As doru said ask what is actually being done. People butchering terms means it can be hard to decipher, but you are trying to avoid detergents and pressurized pump/machine forcing fluid through the transmission to “clean” it.
A fluid exchange, some people call a flush but I’d argue all you are doing is exchanging all of the fluid, is often done in a commercial setting by breaking the trans cooler lines and hooking them up to a machine that has a bladder inside separating old fluid and new. As the old fluid is pushed out of the transmission by its internal pump that volume pushes new fluid from the machine back in to the transmission. If done correctly this gets the majority of the old fluid replaced with new fluid and you have.. exchanged the fluid.