My new housemate is disgustingWatch
Do it overtime as to not 'gang up' on her, e.g. first ask her nicely if she could do the dishes more often, wait until the next time she plans on having someone over to say the noise is a bit too loud and to just try be a little quieter, essentially give about a week or two between any complaints. It can be intimidating and feel like a personal attack when someone doesn't like the way you live.
Follow it up firmly but respectfully if she still doesn't, don't get to argument level unless absolutely necessary. It'll just make things worse. If you get angry or aggressive about it, she'll just be pissed off and do them more or x10 in spite.
I just knocked on and said to him to pack it in moving the wet stuff because it would end up costing us all money, and wash your stuff mate, or i'll bin it all
Just tell her to stop being an inconsiderate scruff
If there are still problems, follow it up, staying as calm and respectful as you can. Arguing doesn't help either of you and just makes things more awkward, especially if there's more than just the two of you in the house. Be firm and remind her that you're living together and that you've got to be aware of other people and how your actions affect them. Living together with housemates can be rough, especially if you're not familiar with each other. Sometimes you're not going to be friends with these people but all you can do is try and get along. Do no harm, but take no crap either.