Transcript for Spring Cleaning Queen Says Being Tidy Is About 'Joy'
It's just about time for spring cleaning. And tonight we bring you the woman at the center of the ultra-trendy movement to declutter your life. It might seem like a daunting task but the key to tidying up might be as simple as a single question. Here's ABC's Sarah Haines. Reporter: Marnie and Matt are fighting a losing battle against clutter. We have a lot of stuff. But what we have the most of are baby clothes. The babies' clothes are in the dresser and the closet, they're overflowing. The clothes have taken over. Exactly. She's got her priorities straight, it's fine. Reporter: A family of four, their two-bedroom home is chock full of baby clothes and loads of hand me downs. I could clothe an entire small country. Some people say it takes a village, you could raise a village. How do you feel when you walk into your home? A little chaotic. A little stressed. There might be a little anxiety. Are you ready to get rid of things? I am ready. We need to simplify. We need to simplify our things and therefore simplify our life. Hi, good morning. Hi. Reporter: So they've turned to organizing guru Marie kando, the queen of clean. With books and viral videos kando has become the face of the declutter movement, helping millions rid their homes of overflow by keeping only the items that spark joy. A professional cleaning consultant by trade, with a three-month waiting list, kando has become a folding phenom. Her unique methods spurring viral videos that are irresistible, almost hypnotic. Here she is folding undies for "New York" magazine. Shirts for "Vogue." A how-to video for all those folding feats. Fans obsessed with lighter living calling themselves #konverts, sharing on instagram and Twitter. And today the titan of tidy is bringing some of that declutter magic to New York. Helping the friedmans find that balance they so desperately desire. Step one, Marie begins her process by greeting the home. Her way of letting the space know she's there to begin tidying up. Next, with the help of her translator, we get to work. Sorting through clothes and king only the items that spark joy. Does this spark joy? Can you feel the joy? Yeah. Don't mind me. Get to work, Marnie, we've got stuff to do, joy-sparking. Reporter: Kondo suggests thanking clothes you've decided to part with. Thank you, really cute sweat pants. Thank you, pants we've never worn. Reporter: Once our mountain of kids' clothes has been reduced to a molehill we tackle her most tame miscellaneous organizing trick, the konmari folding method. Folding 101, folding clothes in half or thirds, you should end up with a rectangle that stands up by itself, helping save space and stay organized. Someone who doesn't need Kondo's help, rishma yaku who calls herself a compulsive declutterer. Clutter is not just paper or objects. It's anything that interferes with your serenity. Reporter: Her Maryland home is immaculate despite housing two growing boys. One of the things that's really important for me is for the eye to have a place to rest. Everywhere there's a thing it takes your energy to look at it, to clean behind it, to manage it. Reporter: You won't find a coffee table in the living room or photos on the wall. I feel like I don't need photographs to see the people that I love. They're right in front of me. Reporter: Her cupboards are neatly packed. Her fridge, tidy in and out. Have you ever had that moment where you like reach behind a bunch of things and you're like, oh, man, I really wanted to eat that and now it's gone bad. That just doesn't happen here. Reporter: In her son Zach's room, his trophies are displayed proudly. And one major compromise. If it was up to him, every wall in this house and his room would be covered. But we agreed just one wall would have things on it. Whatever he wants can go on this wall. So he has put up whatever makes him happy right there. Your environment should be an expression of who you are. If somebody needs to live in an environment that is completely free of anything, then maybe that's what they need in order to think creatively, in order to get work done. Everybody is different. Reporter: She says her clutter-freestyle is all part of healthy living, getting rid of the material things to focus on what matters. I like to be able to look around my home and not be reminded of 50 things I need to do. All the things I need to do are written on a list where they belong. Sometimes all our stuff can really drag us down and keep us weighted. And our brain functions better when our surroundings are neat and organized and filled with things that we can feel good about. Reporter: Back at the friedmans our sorting, purging and folding is finally done. Items placed neatly in drawers or closets. How much easier is it with the standing-up method? So much more fit in the drawer. Now that you've gotten this figured out does this inspire you to apply it across the house? It does. It makes it feel do-able, not daunting. Reporter: And voila, a kids' room with space enough for all that stuff and the little one too. Whoa! It's like being at someone else's house. Reporter: For "Nightline," I'm Sarah Haines in New York.
This transcript has been automatically generated and may not be 100% accurate.