Is it sufficient to wipe madhy or wady from a garment with water to purify it, repeating that three times, given that the questioner follows the Maliki school of thought?

Madhi (pre-seminal fluid) is impure and nullifies ablution. The penis must be washed, and according to some scholars, the testicles as well. It suffices to wipe the spot where the madhi is, then immerse it in water, washing it in a way that removes the impurity, so that the water separates from it clean and unchanged by it. Mere immersion without sufficient washing is not enough. The purification requires the removal of the substance of the impurity, and its ruling is lifted with the disappearance of its taste, color, and odor, except for any color or odor that is difficult to remove. If you are unsure whether a white discharge is wadi (post-urination fluid) or something else, washing it is not obligatory, as the default state of things is purity. However, if it is highly probable that it is wadi, then immersing it in water until the water separates clean and unchanged is sufficient.