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Wiping impurities on the floor

Q: I have messed impurities on the tiled floor a while ago and have not cleaned it correctly (just wiped it with a dry cloth). I'm very worried about the impurities now. What if somebody walked on it with a wet foot and spread it? Is their Salaah accepted? Will I be responsible for it? The house has a domestic helper that cleans the house. She uses a bucket of water and cloth to clean the floor by dipping the cloth in the water bucket every once in a while and wiping the floor around the house once. (The floor becomes very wet and is air dried). There are no visible traces of the impurities anymore. Since the domestic helper cleaned the house and floor, can I assume and conclude that the floor is clean? What should I do? Please please help me. I am extremely extremely stressed and worried. This issue is negatively affecting my life and affecting my performance in my exams