Wow its been years since i saw and used that stuff.
I think it was popular years ago because stock motors where sealed and we could not take them apart. So dipping it in the bath and running it would clean the motor fairly well. I used it to clean and break in some motors. Since everything is now servicable the proper way to clean a motor is tear it down to its peices and clean it with either motor spray or my fav brake cleaner(its double the can at half the price) I have been using it for 10years.
If you realy had to have a bath i suppose you could empty a motor spray can into a jar. The down side of the bath was the crap stayed in the bath for the next motor to swirl around in.