You should not pay attention to doubts which are baseless. In your situation, it is just sufficient you pour water on the floor to make sure the place is clean. If any impurity is attached to shoes, just rubbing those shoes or walking on ground turns them pure.
Abu Hurairah (May Allah be pleased with him) reported: A bedouin urinated in the mosque and some people rushed to beat him up. The Prophet (peace be upon him) said: “Leave him alone and pour a bucket of water over it. You have been sent to make things easy and not to make them difficult.” (Al-Bukhari)
Moreover, Abu Hurairah reported: The Messenger of Allah (peace be upon him) said: When any one of you treads with his sandal upon an unclean place, the earth will render it purified. (Abu Dawud)
Almighty Allah knows best.
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