Also just an idea for making sure, the washing machine gets depleted: just attaching a button at the washing machine, which is pressed, if you take out the clothes. I’m thinking of Amazon Dash Button:
In that case, adding a item “Washingmachine_full” would be ON the same time, Washingmachine_OpState goes over to “MODE_FINISHED”. So you can add a rule, if the state of Washingmachine_full is ON since 30mins or so, you get some more decisive action like some creepy sound playing in the house, or whatever you like. That’s our pain even getting some pushovers to your mobile when the machine is ready: you press OK and it’s easily forgotten.