What is the ruling on holding a doorknob that has become ritually impure (najis), if washing it would lead to the ritual impurity of the house's carpets?

It is clear that the questioner is suffering from obsessive doubts (waswasah), and she is advised not to pay attention to them and to ignore them. The doorknob does not become impure unless the child's hand is wet or the doorknob itself is wet. If the doorknob is confirmed to be impure, it is purified by pouring water over it. If the water separates from it without being changed by the impurity, it is judged to be pure, and whatever it touches does not become impure. One is warned against giving in to obsessive doubts, as it leads to great evil.