How to deal with dirty dishes?

It's only been 4 months! I'm already looking for a new place to move into for august/september!

I live with 4 other students. 2 of my housemates leave dirty dishes lying there for days, sometimes even a week unwashed.

The 3 of us have talked to them about this in a group meeting, where everyone's feelings were talked about. We said that we understand that it does not have to be washed straightaway, they said they would wash their dishes the morning after. That was what they said, but since then they have gone home for 4 days and left their dirty dishes, knowing that they won't be there to clean it. Once, I had come down and there was a bug left on a dish that they surprisingly washed but left out to dry. I'm just talking about cleanliness and consideration for others. They have reverted back to their disgusting behaviour. Even though, there is washing bowl that they have, that we put their dirty dishes in, it is still there and is annoying me.

Over the holidays: before I left the house to go back home, I left a note above the sink saying that no dishes to be left out whether clean or uncleaned, you've been warned, the ending was meant to be lighthearted. The note was a reminder, not an insult, I mentioned no names and similar notes reminding students to clean up before holidays had been pinned up in the university's communal kitchen. But, looking back now, perhaps a note was not a good idea as it can be read differently, however I am not able to catch them all at the same time to talk to them and how can I trust them to clean up without me there, if they haven't cleaned up while I've been living there?

The two people then overreacted, saying I should have spoke to them, calling me pathetic and immature. But what is the point, if I have spoken to them about their dishes before and they had taken no notice? I should not really have to be speaking to 19 year old students about this issue.

I can't put their dishes in their cupboard as my other housemate who I have no problems with, shares the cupboard with the two. I don't want to, nor should I have to wash their dishes up for them, I'm not a cleaner and they would not learn from it.

I've just had enough of their lies- that they are reusing a baking tray or whatever, blaming each other: that the dirty dishes are not mine, it is (insert name) (all 3 of us have eyes and live there, we know what goes on) and their insults.

No excuses, it doesn't take long to do the dishes.

note: my boyfriend got mad after they left their dishes unwashed, when they went back homes for 4 days and left one of their plates out in the garden. They still have not noticed that their plate is out there or missing.