I like to do yeast starter splitting instead of washing.
Its basically the same idea as yeast washing (getting more bang for your buck out of your yeast) except without the washing part, and your yeast is healthier!
First, I prep, boil & clean 6-8 quart mason jars, making sure to keep the mason jars topped off in the pot with boiling water. Boil your lids and the tips of a pair of tongs, I can screw the tops of the mason jars on while still in the boiling water, its not very hard.
Then I shove em in the freezer and get them down to pitching temp.
While I am boiling the jars I am also am boiling a 2L flask of 1.080 starter wort from ex-light DME, this neatly comes out to 1lbs. Then I chill this guy down.
Once everything is down to temperature, I take my mason jars and get them ready for action. This involves removing the lids and pouring out 2/3rds of the water. Then I take my chilled wort, throw in my vial, mix vigorously and then start filling up the mason jars with my wort + yeast until its about 3/4 the way full.
The extra water that was still in the mason jars dilutes the stronger wort down to around 1.045, and i get about 3-4 liters worth of starter in nice clean separated containers for use later!
This method will let you propagate out as much yeast as you need, while keeping it sanitary and convenient. The yeast never has to go through fermenting an entire beer and getting worn out from the process.
Since you are always using this low stressed yeast you should be able to use each of these mason jars as the basis for another starter, which you could then split again into many more mason jar starters!
So far this method is working awesome for me.