This would have been enough for you, and the Prophet ﷺ struck the ground with his hand. He then blew it and wiped with it his face and hands. Being doubtful Salamah said: I do not know (whether he wiped) up to the elbows or the wrists.
إِنَّمَا كَانَ يَكْفِيكَ وَضَرَبَ النَّبِيُّ ﷺ بِيَدِهِ إِلَى الأَرْضِ ثُمَّ نَفَخَ فِيهَا وَمَسَحَ بِهَا وَجْهَهُ وَكَفَّيْهِ شَكَّ سَلَمَةُ وَقَالَ لاَ أَدْرِي فِيهِ إِلَى الْمِرْفَقَيْنِ يَعْنِي أَوْ إِلَى الْكَفَّيْنِ