When you were together did the father assist in the girls bathing? Is the two year old still in diapers? Is the dirt to the point of being a health hazard?

If I was a father of two young girls I would be terrified to bathe them for fear I would be accused of some sort of inappropriate behavior.

How was the father supposed to prevent the bug bites? I was in Florida a month back and despite using OFF was covered it bites.

And lastly I agree with the other respondents who opined that the nine year old should be able to brush her own hair and teeth without adult supervision.

I disagree with the people who say she should be responsible for the younger sister.

What you should do is calm down, call him and get his side of the story. Then come to an agreement as to what the expected hygienic requirements are for overnight visitations. If he can't handle it then you should only let him have the girls for individual days and have them come home at night so you can clean them to your satisfaction.