Yeast washing is actually very easy and little things like this don't matter IMO. I used to be very meticulous about it, making sure to get the yeast as clean as possible and leaving all the trub behind. Now all i do is fill up a jug with water, dump it on my cake, swirl around, separate into separate jars. After about a half hour the trub settle most of the way and I dump the top liquid from the jars into a final jar, and put that in the fridge. The yeast doesn't get as clean, and I probably don't get it all, but I get plenty to store.