ps. From #21:
“You can add between 10 to 15 drops of essential oil (per 2 gallons) to your homemade laundry detergent. Add once the soap has cooled to room temperature. Stir well and cover.
Essential oil ideas: lavender, rosemary, tea tree oil”
Citrus essential oils like grapefruit and orange are good, you could add more drops, and they are quite cheap, especially orange, when bought in bulk. I buy my EOs mostly from Essentil Oil University (do a search for it, it’s .org). They sell to producers, not retail, but you just need to write something up, no paperwork needed. I do sell stuff anyway. I recenently ordered a bunch of oils, the orange was something like $13 for 16 ounces. Pure, good quality.