Advertising is one big pot of flattery — it all sounds right.
Tips
culture
In folk belief, souls headed for reincarnation drink 迷魂汤 (also 孟婆汤) at the underworld crossing — it erases their past life. The set phrase carries that sense: words that make you forget who you are and what you know.
usage
Often with 灌 ('to pour'): 灌迷魂汤 = 'to pour sweet talk over someone.' The target is the passive receiver of the dose.