Muhammad ibn Yahya narrated from Muhammad ibn al-Husayn, from Safwan, from Al-Ala, from Muhammad ibn Muslim, who said:
I asked Imam عليه السلام about a man washing his wife’s body (if she dies and there is no other woman present to wash her). Imam عليه السلام said: "Yes, from behind the clothes."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 1, p. 463