What is the ruling on using "Montana" perfume, bathing with water in which it has been boiled, and fumigating with sandarac herb and raw musk to expel the Qareen (companion Jinn), and what is the specificity of Surat "Qaf" in revealing the Qareen, and does talbina (barley broth) remove sadness?

There is no harm in seeking ruqyah (definition) from someone known for their uprightness and sound belief, and there is no harm in listening to Surat Qaf with the intention of ruqyah. However, one must avoid using herbal incense and rely instead on the authentic supplications and legitimate ruqyah, as the use of incense is among the rituals of charlatans. The qarin (companion jinn) is a trial from Allah, and the servant must protect themselves from its evil by striving against the doubts and desires it instills, through patience and certainty.