What are the general guidelines to follow when using essential oils to fragrance liquid soap? To me, it tends to have a funky smell without anything. I want to use lavender, which i know will cloud it and that is okay because it looks okay to me, but I don't want to overdo it. I tested some in a 4 oz bottle with 8 drops of lavender eo and stirred well. It only has a very slight lavender fragrance, so I think it needs more, but I don't want to add too much. What amount to you all think is sufficient for 4 oz of liquid soap?