When you have a really messy house how is the best way to start clean?

start with one room at a time. clean out the clutter, do the 3 box thing, save, throw away and recycle at the thrift shop. Then start at the top of the room and work down as dust settles down. Dust, vacuum etc.

Once you get one room clean, move on to the next. It will give you a sense of accomplishment. I would start small with the bathrooms, and then the kitchen.

I agree with the one room at a time, it just works better and you don't get so distracted by going to another room and can finish much quicker. Take a break between rooms, or even do one a day for larger rooms. When you see the first couple done, you will see how much easier it is to do and just what you can accomplish and how much better it is when it is done.

I agree with Dee, start with one room. I personally use clear plastic storage containers with lids from Walmart. They can be labeled, stacked or stored in a cabinet, closet or under a bed. Rule #1, if you haven't worn it, used it, or no longer need it.....discard it or donate it. You'll be surprised how much room you'll have when you're done. YOU CAN DO THIS!!! Best of luck.

One room at a time, and you have to be so disciplined, once you assign something a place- don't allow yourself to put it down somewhere else "just for now" it becomes second nature after a while but in the beginning its so tough to not just push it off. We've all been there I think. You got this!!! As you go, ask per specific room for advice here on the forum- we're in this with you!!!

One room at a time. Use three boxes, one for things to keep, one for things to donate, and one for trash. Be ruthless! This is my toughest job, too, because I always think I can use something that's still good. Then I don't use it--so I've learned to donate so someone else can enjoy it.

No matter what age you are, downsize now or you will be smothered in 'stuff' when you reach retirement. Above suggestions are excellent.