4 of 5 DCs have allergies to biological washing powder, as well as OH. I love the smell of clean washing, so was thinking I could put a couple of drops of tea tree and lavender oil in the detergent drawer with the detergent, just make things smell nice, without turning the house into a scratch fest. AIBU in thinking this would work? Or, is it a completely mental idea? Don’t want to knacker the machine!!