Is the impurity of pork like the impurity of dog saliva? Is it sufficient to wash a knife contaminated with pig blood with water and soap to purify and use it?

The impurity of a pig is like the impurity of a dog. Therefore, a knife that has cut pork must be purified by washing it seven times, one of which is with earth. Some scholars are of the view that what takes the place of earth, such as soap or alkali, is sufficient if it cleans and purifies.