Our Nabi was perfect in both cleanliness and upkeep, we will never accept your false claims.walaal i'm telling this for your own benefit, it's best to acquire and seek knowledge before you come to a decision this is especially so when it comes to matter relating to diinta. Are you so confident in your knowledge of the deen to claim without a doubt that what sh umul is saying is completely wrong and he's saying it for the sake of it ?
1) Narrated Anas bin Malik:
Allah's Messenger (ﷺ) used to visit Um Haram bint Milhan she was the wife of 'Ubada bin As-Samit. One day the Prophet (ﷺ) visited her and she provided him with food and started looking for lice in his head Then Allah's Messenger (ﷺ) slept....
(Sahih al-Bukhari 7001, 7002, Book 91, Hadith 20, Vol. 9, Book 87, Hadith 130)
https://sunnah.com/bukhari/91/20
2. Narrated Zaynab:
She was picking lice from the head of the Messenger of Allah (ﷺ) while the wife of Uthman ibn Affan and the immigrant women were with him.
Sunan Abi Dawud 3079
In-book reference : Book 20, Hadith 152
English translation : Book 19, Hadith 3073
https://sunnah.com/abudawud/20
3. Narrated Abu Wail:
Abu Musa Al-Ash`ari used to lay great stress on the question of urination and he used to say, "If anyone from Bani Israel happened to soil his clothes with urine, he used to cut that portion away." Hearing that, Hudhaifa said to Abu Wail, "I wish he (Abu Musa) didn't (lay great stress on that matter)." Hudhaifa added, "Allah's Messenger (ﷺ) went to the dumps of some people and urinated while standing."
Sahih al-Bukhari 226
In-book reference : Book 4, Hadith 93
USC-MSA web (English) reference : Vol. 1, Book 4, Hadith 226
https://sunnah.com/bukhari/4
There's a lot of things that we do not know about diinta that's why it's important to humble oneself and reflect over our own shortcomings that hinder us from understanding our deen.
I hope and pray that Allah keeps you steadfast, increase you in goodness and understanding of the deen.
Ameen thumma Ameen