What is the ruling on vegetable oil that a dog drank, with traces of the oil remaining and the edge of a piece of cloth touching it?

To purify a vessel licked by a dog, it must be washed seven times, the first of which is with earth, due to the hadith: "The purification of the vessel of one of you, when a dog licks in it, is to wash it seven times, the first of them with earth." The earth should be mixed with water until it becomes turbid, and it is not sufficient to merely wipe the impurity with dry earth. This is the fatwa on the website and is the view of the Shafi'is and Hanbalis, while the Malikis consider it recommended to wash it seven times without using earth, and the Hanafis consider it obligatory to wash it three times or more.