Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
abudawud:349Maḥmūd b. Khālid al-Dimashqī > Marwān > ʿAlī b. Ḥawshab > Saʾalt Makḥūl > Hadhā al-Qawl Ghassal Wāghtasal

one should was one's head and body well (and not than one should makes one's wife wash).  

أبو داود:٣٤٩حَدَّثَنَا مَحْمُودُ بْنُ خَالِدٍ الدِّمَشْقِيُّ أَخْبَرَنَا مَرْوَانُ حَدَّثَنَا عَلِيُّ بْنُ حَوْشَبٍ قَالَ سَأَلْتُ مَكْحُولاً

عَنْ هَذَا الْقَوْلِ غَسَّلَ وَاغْتَسَلَ فَقَالَ غَسَّلَ رَأْسَهُ وَغَسَلَ جَسَدَهُ