Nothing at all.
My friends' (a couple) son had been having fever for a long time
and went in and out of hospital. Soon they suspect their house got
dirty thing.
They got Fr Simon to help. Fr Simon went to their house. He did
nothing. He just sat in the living room relaxing. After a while, he
got up and removed an eagle sculpture from the living room. After
that the couple realised that the sculpture which they bought from
Indonesia was dirty. Since then, the boy became well.