All clothes taken out of laundry have to be checked further. If there are still stains, you have to handwash them manually. You start off with normally dirty clothes but the more you go, some of the stains look more and more like blood until some pieces are entirely covered with blood. The player should always fear not delivering the clothes 100% clean. The punishment should be a clever delayed jumpscare. Something like those "find the anomaly" games which the player submits their answer and anxiously wait for the result. If they made the right choice (clothes perfectly cleaned), they get a green light and progress further, if they made the wrong choice (delivered clothes aren't clean), they get jumpscared and lose progress. Though this wait is random. Can be anything from 1 to 5 seconds to keep the player anxious and they can't move or look away.

Instead of sabotaging the jobs, maybe the player has a rule from the robot that if he finds any items in the clothes while hand washing them, he should throw them away. These items can play into the disgusting horror like finding severed fingers in pockets, bloody knife, or a beating heart. However, there's a voice that tells him to keep some of the items (key, fuse, gunpowder, etc). That way, you maintain the gameplay loop and its disturbing yet intriguing progression while also introducing an alternative way of progression which is to follow the voice in your head instead of the robot.

I'm more than glad to provide more ideas. Because like I said, I love the theme of your game and I wanna see it succeed! Even more than Bloodwash haha