The ground and everything fixed on it, such as buildings and walls, can be purified by sunlight. However, things resting on the ground, such as trees, leaves, fruits, plants, doors, windows, nails, and wooden structures used in buildings cannot be purified by sunlight as an obligatory precaution.
To purify objects with sunlight, (in addition to the removal of the impurity and the object being wet with impurity), it is required that the drying be due to direct sunlight.