وَشَرْطُ صِحَّتِهِ ثَلَاثَةٌ: عُمُومُ الْبَشَرَةِ بِالْمَاءِ الطَّهُورِ، وَانْقِطَاعُ مَا يُنَافِيهِ مِنْ حَيْضٍ وَنِفَاسٍ وَحَدَثٍ، وَزَوَالُ مَا يَمْنَعُ وُصُولَ الْمَاءِ إِلَى الْجَسَدِ كَشَمْعٍ وَشَحْمٍ
1. Purifying water reaches the full required area.
2. Menstruation, Nifas, or another continuing invalidator has ceased.
3. A real barrier such as wax or solid fat is removed.
Mere oiliness that does not block water is not the same as a solid barrier.