We know that if we sprinkle a handful of water over madhiy on a garment, it is sufficient according to the most authentic opinion. But I have a doubt. If stains or traces of madhiy still remain after sprinkling the water, do I have to sprinkle water again in that area? Or is sprinkling a handful of water once sufficient regardless of the stains or traces of madhiy that remain? And is the water that was splashed on madhiy pure?
Water is regarded in fiqh as having the attribute to be tahir: clean
Moreover it is regarded as
meaning it is clean طاهر (by itself) and cleaning مُطَهِّر (anything which comes in contact with it).
We could also say madhiy (a spot) usually is less the quantity of water (a handful) used for the act of cleaning therefore the water used in such a case is still regarded as tahir in the majority view.
But we know from fiqh and from hadith sources that the only requirement for removing or maybe it is better to say handle madhiy is by sprinkling water over it. This requirement was nowhere extended to remove the traces of madhiy (if madhiy is regarded as najasah then this would be a special case).
Therefore the above discussion can be closed by saying handling madhiy is done and fulfilled by only sprinkling water over it there's no necessity to remove it or its traces.
As to the topic of stains of najasa it was already discussed in the following posts:
And what must be cleaned or removed, if najasah (color, odor and taste) is removed is explained in:
Ritual impurity in pants
Sheikh 'Assim in a YouTube video said:
Sprinkling it does the job even if there are marks. Ignore it and pray with it.
This fatwa on Islamweb also says it is sufficient to sprinkle water over it according to some scholars.
There is no doubt that "sprinkling water does not remove the impurity," as Ibn Qudaamah may Allaah have mercy upon him said, but some scholars are anyway of the view that it is sufficient to sprinkle water over it in order not to cause hardship and embarrassment, pursuant to the Ahaadeeth that provide that sprinkling water is enough, like the Hadeeth: “….what about that clothes it touches? and the Prophet sallallaahu `alayhi wa sallam ( may Allaah exalt his mention ) replied: It is enough for you to take a handful of water and splash it over the part of your clothes that you see it has touched.” [Abu Daawood] And the Hadeeth narrated by ’Ali may Allaah be pleased with him about Mathy which reads: "… and splash water over your genitals."
Hopefully this answers the question. And Allah knows the best.