So, I have an AquaC EV120. It works OK, but the neck (which is a straight cylinder) tends to get a coating of poo on it. Using a sponge often knocks the poo loose and back into the skimmer body, requiring the skimmer to skim it out again, so I make this super simple neck squeegee that doesn't let the poo fall back in... So obviously, it is thin enough to fit in the neck with the cup off, and I just hold it by the top part, fit it in and scrape the poo with the lower lip, the crap just falls into the cup, then rotate and do all the sides. You can use whatever flavor of yogurt you want!