This is the hanbali madhab
In their article (islamqa) they say that the
"The scholars of the Permanent Committee (5/364) were asked: Many people use luxury carpets in their homes. If a child of any age, for example, urinates on the carpet, is it sufficient to pour water on it in order to cleanse it of the impurity, seeing that the carpet may be large and may be attached to the floor [fitted carpet], or there may be large pieces of furniture and beds on it, or not?
They replied: If the one who has urinated on these carpets and the like is a [baby] boy who is not yet eating solid food, sprinkling water over the entire area affected by the impurity is sufficient to purify it, and it is not essential to squeeze it or wash it.
But if the child is eating solid food, or is a girl, regardless of whether she is eating solid food or not, then it must be purified by washing. It is sufficient to pour water on the site of the impurity, and it is not essential to remove the carpet or squeeze it; this is like the way of removing impurity on the ground, because it is proven in as-Saheehayn from Anas (may Allah be pleased with him) that a Bedouin urinated in the mosque and the Prophet (blessings and peace of Allah be upon him) instructed that a bucket of water be poured over his urine. End quote."
The hadith above is in bukhari according to sunnah.com and it reads
حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، قَالَ حَدَّثَنَا هَمَّامٌ، أَخْبَرَنَا إِسْحَاقُ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم رَأَى أَعْرَابِيًّا يَبُولُ فِي الْمَسْجِدِ فَقَالَ " دَعُوهُ ". حَتَّى إِذَا فَرَغَ دَعَا بِمَاءٍ فَصَبَّهُ عَلَيْهِ.
Narrated Anas bin Malik: The Prophet (ﷺ) saw a Bedouin making water in the mosque and told the people not to disturb him. When he finished, the Prophet (ﷺ) asked for some water and poured it over (the urine).
Reference : Sahih al-Bukhari 219
In-book reference : Book 4, Hadith 85
USC-MSA web (English) reference : Vol. 1, Book 4, Hadith 218
(deprecated numbering scheme)
There is also a narration by Abu Huraira:
حَدَّثَنَا أَبُو الْيَمَانِ، قَالَ أَخْبَرَنَا شُعَيْبٌ، عَنِ الزُّهْرِيِّ، قَالَ أَخْبَرَنِي عُبَيْدُ اللَّهِ بْنُ عَبْدِ اللَّهِ بْنِ عُتْبَةَ بْنِ مَسْعُودٍ، أَنَّ أَبَا هُرَيْرَةَ، قَالَ قَامَ أَعْرَابِيٌّ فَبَالَ فِي الْمَسْجِدِ فَتَنَاوَلَهُ النَّاسُ، فَقَالَ لَهُمُ النَّبِيُّ صلى الله عليه وسلم " دَعُوهُ وَهَرِيقُوا عَلَى بَوْلِهِ سَجْلاً مِنْ مَاءٍ، أَوْ ذَنُوبًا مِنْ مَاءٍ، فَإِنَّمَا بُعِثْتُمْ مُيَسِّرِينَ، وَلَمْ تُبْعَثُوا مُعَسِّرِينَ ".
Narrated Abu Huraira: A Bedouin stood up and started making water in the mosque. The people caught him but the Prophet (ﷺ) ordered them to leave him and to pour a bucket or a tumbler of water over the place where he had passed the urine. The Prophet (ﷺ) then said, "You have been sent to make things easy and not to make them difficult."
Reference : Sahih al-Bukhari 220
In-book reference : Book 4, Hadith 86
USC-MSA web (English) reference : Vol. 1, Book 4, Hadith 219
(deprecated numbering scheme)
Im not one-hundred percent sure if sunnah.com is trustworthy in terms of ratings, and they give no ratings for the hadiths above anyways. Their citations should be trustworthy as well as the hadiths they post (in and of itself, not including the ratings)
But they have a hadith on their website classed as sahih and you guys can read it your self: https://sunnah.com/urn/1101740
Here is the islamqa article it essentially states for purifying something on a carpet one must pour water on it until there are no signs or traces of it (color, smell, etc.) but one should read the article for context:
https://islamqa.info/en/answers/213577/how-can-carpets-be-purified-and-what-is-the-ruling-if-any-impurity-has-dried-up-without-water-being-poured-on-it
