How do Gene Stealers cult get rooted out?

So I recently read a bit here about a planetary governor that got so spooked that the Inquisition were going to exterminatus his planet due to a genestealer cult, that he basically bombed 99% of it himself. Several posters said that while some Inquisitors would indeed just headbutt the red button, there are examples in lore of genestealer cults that get rooted out without the entire planet going boom. Does anyone know how inquisitors manage to do that and are there books or examples about this?