Okay, I will admit it. I hate the easels in my classroom. Not because I don't think they are amazing for the kids (I do!) but because they are such.a.pain.in.the.butt. I have spent hours of my life rinsing, soaking and drying paint cups.
I am SO happy to say I will never waste time scrubbing away at tiny plastic cups ever again.
Here's the trick (it is SO easy):
Collect your clean cups.
Put a sandwich bag inside each cup, pulling the excess bag back over the rim of the cup so that it hangs on the outside of the cup.
Add paint (inside the baggies).
Adding the plastic bags takes a few seconds longer during set up, but saves TONS of time when you want to add new paint! All you have to do is take of the lid, pull out the bag and throw it away. Then you can add new colors quick as can be.