Aḥsanallāhu ilaykum, Is your prayer valid if a drop of urine falls on your pants and you don’t wash it but let it dry? And is it valid if a wet dog touches you and you also just wait until it dries, without washing? Do you still have to wash it after it has dried? Jazakallahu ghairan

Ustadh AbdulAziz al-Haqqan
Actually, wash, wash. When a drop of urine happens, where you saw the urine, you can wash that spot only. It will be a very small spot. And if you suffer from waswas, then this is something else.