Kris Jenner is a "clean freak"

Speaking to PEOPLE, Kris shared: "Kourtney started using plant-based products years ago, things that were all natural and organic."

During her younger years, Kris was led to believe that if something was clean, it would smell like chemicals. And that idea prompted Kris to take matters into her own hands.

She said: "I grew up believing the stronger it smelled, the cleaner it was, so I'd go over to her house, and it didn't smell the way my house smelled. I'm kind of a clean freak."

Kris would clean Kourtney's house when she went away on holiday.

The TV star shared: "Kourtney would go on vacation and I would sneak over to her house and take all my strong products and clean her house, thinking she would never find out."

But now, Kris is happy to take Kourtney's advice on cleaning products.

She said: "Kourtney even made me throw away my plastic products and cooking pans that were [covered in chemicals]. So we've been through this journey together. She really taught me a lot about protecting your family when it comes to household products, and I finally paid attention."

Kris also revealed that she remains obsessed about cleanliness.

She explained: "From the time I was very young, it was very important to me to have things in order.

"I had six kids when I was really young, so I always wanted things neat. I'm a perfectionist and a control freak. I just wanted everything to be the way I wanted it."