Sayyidah Maymunah bint Sa'd (may Allah be pleased with her) said: O Messenger of Allah, give us a ruling: from what is the punishment of the grave? He (peace and blessings be upon him) said: "From the traces of urine. So whoever is touched by urine, let him wash it, and if he does not find water, let him wipe it with clean earth."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21531