I agree with the choices of cleansing, I would also add myrrh and as weird as that sound, rain-fragrances!
Regarding Demons, each of them has their associated/preferred incense/fragrances. You can ask them which they prefer.
Usually, you cannot go wrong with these:
Air Demons - lighter fragrances (like bergamot)
Earth Demons - woody scents (like patchouli or sandalwood)
Water Demons - floral scents (like lily)
Fire Demons - deep, strong scents (like cinnamon or rose)
If you don’t know their element, but know (or prefer) the attributes* to that Demon and what they usually represent, then you can base it off of that too! (*although they’re always general, a lust Demon may work with you on appearance, so it’s good to keep in mind that attributes may not always be 100% right!)
For example, if you’re working with Rosier on love, you may use fragrances related to that (like for example Rose)
Hope of that was helpful!