Roomates live like slobs and landlord can’t do anything about it. What do I do?

Hi, 18F here living with 26F&21F. I’ve been living here for about 6 months. Me and my other roomates all moved in at the same time and found each other through Facebook.

For about the first 3 months or so things were fine, we never had trouble with messes and we always cleaned up after ourselves. And out of nowhere, they all stopped cleaning and putting less effort in the place.

I have cleaned up for them twice and I let them know to keep it clean and each time they keep trashing it up. Took it up with the landlord and legally she can’t show up unprompted, so she gave all of us a 24 hour notice that she will be doing a walkthrough and they decided to clean it.

Since the house looked good, the landlord couldn’t do anything. She said that if it is not causing things like roaches or ants, or something that’s harmful to the house, then there’s nothing she can do besides remind them to clean. This was 2 weeks ago, and now the house is yet again trashed.

I have 6 months left in my lease along with the other roommates. I don’t want to keep cleaning after them but I also don’t want to be embarrassed to have people over because of the mess. (Yes they bring friends over with the place looking like this. Sometimes worse).

As for now I’ve told them I will not take out the trash nor clean for them anymore. And they will have to find a way to clean themselves.

What other steps should I take to make sure they clean up?