When I was my yeast this is the process I take: and thanks HBT app because I wrote all this out and it crashed lol:
Get a 1/2-1 gallon jug with a lid
4x1 pint mason jars with lids
Tongs
In a large pot bring the containers and lids to a boil for 10 min.
Then with sanitizer tongs take them out of the near boiling water while filled, and put on the counter and cover with the sterilized lids.
Do the same with the jug, with about 1/2 gallon inside it.
Let them cool to about room temp.
After you rack your beer and leave the yeast cake undisturbed.
Then add all the water from the containers into the fermenter and stir vigorously.
Keep fermenter tilted to help collect the trub and let it sit for 30 min or until a good layer of trub forms.
Carefully decant the top liquid above the trub into your jug.
Let that sit again until there's a good layer of trub again.
Decant now into the pint jars trying not to disturb the trub.
Seal and label pint jars and toss them in the fridge.
These are pictures from my last wash when I did this process. Hope this helps.
Jug after first wash
Pint jars after second wash
One pint jar after 48 hours in the fridge