IT IS MUSTAḤABB to make abundant dhikr of Allah 
and du‘ā’ for the deceased whilst washing and shrouding him. Our colleagues say that if the one who washes the deceased finds something that impresses him about the deceased, like the light in his face, a pleasant smell or suchlike, it is mustaḥabb for him to tell people about it. If he finds something unpleasant, like the darkening of his face, a foul smell, a change in his limbs or the transformation of his appearance, it is ḥarām for him to talk about it to anyone. They cite as proof the following.
and du‘ā’ for the deceased whilst washing and shrouding him. Our colleagues say that if the one who washes the deceased finds something that impresses him about the deceased, like the light in his face, a pleasant smell or suchlike, it is mustaḥabb for him to tell people about it. If he finds something unpleasant, like the darkening of his face, a foul smell, a change in his limbs or the transformation of his appearance, it is ḥarām for him to talk about it to anyone. They cite as proof the following.We relate in the Sunans of Abū Dāwūd and at-Tirmidhī that Ibn ‘Umar 
related that the Messenger of Allah 
said: “Mention the good traits of your deceased and abstain from [mentioning] their bad ones.” [1].At-Tirmidhī regarded this hadith as weak.
related that the Messenger of Allah said: “Mention the good traits of your deceased and abstain from [mentioning] their bad ones.” [1].At-Tirmidhī regarded this hadith as weak.We relate in as-Sunan al-kabīr of al-Bayhaqī that Abū Rāfi‘ 
, the freed slave of the Messenger of Allah , reported that the Messenger of Allah said: “Whoever washes a dead person and keeps what he sees on him a secret, Allah will forgive him forty times.” [2].Al-Ḥākim Abū ‘Abdullāh narrated this in his al-Mustadrak ‘alā aṣ-Ṣaḥīḥayh and said that this hadith is ṣaḥīḥ according to the criteria of Muslim.
, the freed slave of the Messenger of Allah , reported that the Messenger of Allah said: “Whoever washes a dead person and keeps what he sees on him a secret, Allah will forgive him forty times.” [2].Al-Ḥākim Abū ‘Abdullāh narrated this in his al-Mustadrak ‘alā aṣ-Ṣaḥīḥayh and said that this hadith is ṣaḥīḥ according to the criteria of Muslim.Most of our colleagues have expressed the same view on this issue, as I have mentioned. Abū al-Khayr al-Yamānī, the author of al-Bayān, however, said that if the deceased is an innovator who exposed his own innovation, and the one who washes him sees something that he detests, then logic dictates that he should tell people about it, to discourage people from committing innovation.
References
[1] Abū Dāwūd (4900) and at-Tirmidhī (1019).
[2] Al-Bayhaqī in as-Sunan al-kubrā (3/395), al-Ḥākim in al-Mustadrak (1/354).