If the impurity is excrement and one has made every effort to remove it, but a trace of the color remains, is it permissible to pray in it?

Question:
Honorable Shaykh, may Allah grant you success, he says: If the impurity is, for example, excrement, may Allah honor you, and it got on the garment, and he made every effort to remove it, but a trace of the color remains, is it permissible to pray in it?

Answer:
If the trace is a smell that is not tolerated, because the presence of the smell is evidence of the presence of the impurity itself. But as for color, some colors are difficult to remove; if you wash it or use something to make it go away, this is tolerated if you are unable to remove it. The Prophet (peace and blessings be upon him) said to the woman who asked him about menstrual blood: “Scrape it off, then pinch it off, then wash it with water,” and then he said, “And its trace does not harm you,” meaning if a color remains that you are unable to remove, leave it; you owe nothing for it.