Washing a carpet purchased from a non-Muslim

I recently purchased a room carpet from a non-Muslim which I intend using as a carpet to perform Salaah on.

There are no apparent traces of najaasat on the carpet but there are a few stains which look like they may be from food or drink.

The carpet is too thick and big to be soaked and squeezed. In order to ensure the carpet is paak, must it be washed once, then left to dry; then washed again and left to dry, and washed a third time and left to dry; in order for it to be paak? Or will one wash and soak be sufficient?