Answered by Ustadh Tabraze Azam
Question: Is using to soil to clean only done when there are dog impurities? E.g. If I believed that there was an invisible impurity like urine or blood could I just wash it once and leave it on the rack to dry?
Answer: Assalamu alaikum wa rahmatullah,
I pray that you are in the best of health and faith, insha’Allah.
Yes, if there is some impurity (such as blood, urine) on your clothing, you simply wash it until no traces remain. If you cannot see the the impurity, you should wash the item of clothing thrice, in the place where you think it has been affected, squeezing each time. [Shurunbulali, Maraqi al-Falah]
Using dust is only a recommendation when removing dog saliva.
And Allah alone gives success.
Checked & Approved by Faraz Rabbani