Start with the 15 ml/gallon
BTW once upon a time I wiped an entire flower table because Dawn dishwashing liquid has no LD50. It was an EPIC fail. But the outcome was I got better genetics. If that happens I have some seeds I can send you just in case
Although I will always remember my husband's hysterical laughter from the bottom of the stairs as I opened my flower room to check on the girls before bed and a WAVE of soap bubbles cascaded over me to the ground floor. I just stood there. Anyway my carpets were never cleaner.