If you’re really only concerned about your child’s well-being, hire someone to clean up before she comes. There’s this app called Homeaglow that lets you hire people for like $40 for 2 hours to clean up messes like dishes and bathrooms. You could get that app and hire someone to go over there when your daughter is supposed to go over and let them clean up before she comes. I say this because I’ve done it.
If they aren’t listening and it’s that bad at least see if you can go to court. I would say have cas go in his home but I don’t want it to make them look at you too and cause issues. That is a biohazard no matter the type of feces
If it was my daughter I'd sit down and have a conversation with him, tell him until his house is clean and safe for our daughter I won't let her go to the house. He should care about the safety of his daughter because if theres rubbish and broken glass on the floor she could hurt herself badly or get sick from the mess. If he tries to threaten you tell him if cps get involved they will go to his house and suggest that he cleans up as the environment will be unsafe for a child also. And another thing to bring up is letting a child see a dirty house will then lead her to think its totally a normal behaviour and she'll start thinking its okay because her dad does it
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Go to court cuz what the heck I’m sorry you gotta go through that being sanitary should never be a second thought