The MityVac accessory is, to my knowledge, the closest you can get to a flush at home. You won't get all the original ATF the first go, but will notice a significant improvement. Cyrk didn't necessarily get ripped, he just paid to have someone take care of the whole process for him. And the fact he's all smiles is testament he made the right choice for him!

And as Tone mentioned (I forgot to, sorry! ) you do need to replace the filter in the process.