The OP was Friday night.

Yesterday, Saturday: 5 tall trash bags full plus one large box. All in garage. DP has not discovered this yet.
Decided that if I find more dirty dish and trash hoarding I will get rid of dresser and nightstand if not used properly.

Left a message with a cleaning person to come clean bath this weekend.

Gave DP warning for kitchen issue or I go ALL disposable.

https://www.steptalk.org/node/230301
Original post with comments...

Today, Sunday.

DP asks me while we are in garage if the stuff is from SD12 room.
Yep.
DP says ok.
I said no more warnings, founds stuff hidden.
He says he knew of some of it but not the extent...then THANKED me.

Turns out he had told SD12 that if her room regressed to an inappropriate state again "drastic measures" would take place.
He agreed to leave all of it in trash bags (I did assure him that nothing put on shelves or left in ok places was moved ... Which leaves almost nothing in her room) and if she wants it she has to take care of the stuff appropriately.

He also agreed that if we find old food, dirty dishes or trash in her dresser or nightstand again she loses those items of furniture. He know she does not use her hangers or dresser for clothing, and nothing but trash was in her nightstand.

All hell is going to break loose when SDs come to us on Tuesday for thei first summer week. He knows and is prepared to deal with her.

Their bathroom is clean thanks to cleaning service. Super lady, will use her again if needed. DP paid.

SDs are with us. SD12 went into her room and gasped.
Went to her dad and said something about her room being cleaned. And something about me running the vacuum. I told SD12 I did run the vacuum with DP gesticulating wildly behind her. She thanked me for cleaning...

I'm like, WTH? To DP. This isn't all on me. Well apparently SD12 has no idea almost of her stuff is not there. DP says to just leave it for her to discover and he has this. Just going to make sure he knows that we are a united front on this and that SD doesn't think it's all me. Because I would be seriously disturbed at that...discussing in a few min with DP...

Edit: Yep all good! We are solid!

So SD12 did figure out that a lot of her stuff was gone.
According to DP she was "upset" but "got some thing out she wanted."
And complained about the usual teen things like how she's always in trouble and it's not fair. DP let me know he explained to her she has the power to stop it from happening again.

So I am avoiding the garage. I have a feeling crap is everywhere and the dishes in there are not put away.
My plan is Saturday to wash and donate ALL the remaining clothing. Wash and put away (in storage) all the dishes and utensils. No one gets to use them now. Because I'm not cleaning them again. DP will help me sort and take to trash because I am NOT cleaning up it all by myself...or wait. Maybe I just freaking leave the pile there. But it's in my way and I don't want the dishes thrown out (good stuff for future). I think DP will help but he's going to whine to high heaven. Which is why as I type HE should do it if he doesn't make SD12. See I get there eventually.

On a side note he was supposed to go to grocery on Wednesday to get food for SDs. Still hasn't done it. I went yesterday for myself only and made dinner for myself only tonight. I will NOT be buying food for them like last year. He can deal with it.

So it looks like SD12 got a few things out of the trash bags but not much. Most of her clothes, underwear and socks are still in the bags along with some nicer stuff like her new alarm clock, a nice bag, a nice portable speaker and perhaps the pieces to her hair iron set.

After some thinking I cannot throw all of it away. I am donating what I can, taking the tax credit, tossing most of it. The good household items are going into storage (easy to do from where the bags sit). I got rid of one bag into trash already and I have another ready for donation.

I feel good about giving the stuff to someone who might WANT and NEED it.

...and now the SDs have the tent out. Which is fine. I just told DP last night that it better be cleaned up, all the contents put acceptably back where they were found, by the time they leave for BMs on Wednesday. Or else that tent will "go away."

DP says, "Don't worry, they will do it. They need to take it down too, right?"
Me, laughing incredulously, "You should help them take it down but THEY need to clean up their stuff."
DP, "Oh, I'm sure they'll do it. Don't worry."
Me, with a completely 'are you kidding face' can do nothing but stare at DP.
DP, "Oh don't be so nevative."
Me, "You are so optimistic it's amazing." Thinking of the days ago issue with SD12.

1) Tent was cleaned up...SD12 actually cleaned up her stuff early - because she wanted to sleep in her bedroom. So long as SHE wants something she'll do it. She also helped me take it down. Complained a bit that SD10 wasn't helping but I reminded her SD10 helped put it up, which took longer. SD10 was a bit of a pill - she actually drug her feet around about getting her things cleaned up...she's usually all over that (call it over-tired). But yay, no issues with tent.

2) DP FINALLY DISCOVERED SD12 IS NOT BRUSHING HER TEETH. EVER. He's pretty horrified and stated that she's got some "weird hang up about it" that he needs to figure out. He realized this when he got a whiff of her breath while watching the movie the other night. Yay me for making him sit next to SDs. He also caught her lying to him about doing it yesterday morning.

3) Neither SD has had a shower in over a week. They have at least been in a pool. But GROSS. SD12s deoderant is in one of the trash bags in the garage.

4) SD12s room is a wreck again. Old pizza (like half a pizza!) on her bed (at least on a plate) since I think Saturday, multiple dirty dishes again, total disaster with as few things in there at this point. We'll see what happens but she may lose more stuff as of tomorrow night. This time DP will directly assist if necessary.

Allrighty.

Get home last night, have a nice quiet dinner with DP.
After dinner let him know we are now going to take care of SD12's room again.

DP: What? It's a mess again?
Me: Yes, just like before; there's dirty dishes, utensils, and the remains of a pizza that's been there since Saturday not to mention wet towels, chip bags, etc. all over the floor.
DP: I told her to clean that up!
Me: Well, she doesn't do it.
DP: Dammit! WTH?
Me: We have to be hard-core DP. It all gets trashed AGAIN. Period. She's been told over and over and the last cleanup didn't seem to have an effect either - I also noticed she's been taking things out of the garage bags here and there which is NOT acceptable. Those will be moved to where she can't get to them and can sit until we can go through them to discard the stuff OR she takes care of the items appropriately (i.e. not dragging the bag into her room and letting it sit there). She cannot use the garage for "storage."
DP: Yes, I agree and I'm so sorry.
Me: We can only just keep moving forward.

So, two more large trash bags full of stuff. She has almost no clothes left at this point, all the dishes join the last ones cleaned out of there (i.e. put away so NO ONE can use them since she's creating the situation) and the THREE wet towels have also been washed and will be put away so NO ONE can use them. DP agrees with this strategy as it will effect everyone in the house.

He did ask me what I'm throwing away...I told him everything that's junk or looks like junk. If she doesn't get her stuff she wants, it will go away - this is non-negotiable. He understood.

The SDs will be back with us on Sunday.

SD12 has been back for almost two hours and hasn't noticed last room clean up...well, I'm in bed. She'll likely notice tomorrow at some point.

Pattern:
DP agrees that something must be done.
DP helps and starts initiating rules and expectations.
DP then gets tired thinks it too hard to do.
DP thinks then the ramifications are too harsh.
DP thinks we should help SD12.

Me:
I am done done done.
If we have any rodent or bug infestations it's All on You DP.
I will get the bags out and put them in garage and if they aren't out of my way by the weekend all of it will be deposited in her room and I'll never ever enter it again.
This has been going on since we moved in so yes, I am making a judgement about your lack of follow up. Absolutely. Basically then her room has been cleaned for her twice more how nice of us.

F it. I'm done with it.
So POd I can't talk.
I am done helping with anything.

Ahhhh, DP made sure SD12 cleaned up her stuff in the garage. The box didn't get touched, so that was popped into the trash bin last night. Done. Whew.

8 days of SDs. I'm exhausted from the constant, constant noise, questions, activity, friends over...normal stuff. SD12 was actually pretty good the whole time with little to no attitude.

SD10 was pretty good but being a little bratty the last two days. I even caught her trying to sneak a knife from the kitchen into the tent (her TF - troublesome friend - was over) while TF tried to create a diversion. I was onto them already so stopped them. No knives outside of kitchen, no forks, no spoons, no glasses. You want something, use the plastic cups or your dad can get you some plastic utensils (which he will do before they are over next time). I was PO'd and told DP, who was oblivious to the deception, that I was really mad that they were JUST told not to take things out and they were actively trying to deceive us...NOT ACCEPTABLE. This is what happens when TF is there...I keep a heavy eye on her and she knows it. I let them cook eggs the other day and told them to use a specific pan, NOT the cast iron (they freaking coat that thing and it's hard to clean egg off). TF spouts off, "But at MY home, I ALWAYS use cast iron." Me, "Well here in THIS HOUSE you WILL use only THAT pan for eggs." I can see her becoming an issue around puberty and being banned from our house (she already was for a while but good behavior earned her way back).

DP said to me last night, "You want to watch an episode of Girls or something?" Me, "Gawd no. No girls. I want to watch something about kings, killing and castles. Men murdering people."

5 days off then one more week of SDs (cry) then 3.5 weeks free. I am counting it down.