Here is one recipe https://www.hometalk.com/16391050/homemade-laundry-scent-booster
I love this laundry detergent that we use. It's an all-natural DIY and made with safe ingredients. You can use it on an HE machine too. Hope this helps! Hugs, Holly
PS - We have a FREE eBook with recipes for all of my homemade and all-natural cleaners. You can download it here --> https://pinkfortitude.com/thank#GreenClean
These essential oil recipes should help you out.