Someone can correct me if I’m wrong, but I’ve been under the impression that once the strawberry milkshake, the transmission will need rebuilding or replacing.
It happened with my ‘71 El Camino turbo 350 years ago, and the milkshake was so bad that the transmission shop had to use another core to rebuild. Maybe they actually just didn’t want to go though the process of the cleaning of mine before rebuild, but the story they gave me was that it was so gunked up with milkshake, that even my original core wasn’t salvageable.