How can a sponge sofa that has been urinated on be purified?

Large rugs that have become impure are purified by pouring water onto thementire impure area until the water overwhelms the impurity. Then, the impure water is suctioned off until the impurity is removed and no trace of it remains. If a trace other than color remains, it does not matter. However, if the color remains, it does not matter.

If the impurity is the urine of a male infant who has not yet eaten solid food, it is sufficient to sprinkle water over the area. However, if the infant has eaten solid food, or if the impurity is the urine of a female, then washing is required by pouring water over the impure spot. It is not necessary to remove or wring the rug.

The method for purifying large rugs is first to remove the physical substance of the impurity, then to pour water over it until one believes its trace has disappeared. Wringing is not a condition unless the removal of the impurity depends on it.