Slurping... Could be the sound of indoor puddles drying up. You could try to make a puddle and let it dry up by itself. That should trigger the sound effect and maybe correct the glitch. Or maybe it isn't a glitch and you really have puddles? Sloppy sims leave puddles in the bathroom all the time after taking a bath or a shower.
If you don't have sloppy sims and none of the suggestions above works you could replace all the plumbing items, including the dishwasher, and see if that helps.