Do Dry Impurities Transfer
If one has washed the area properly and there are no clear signs of unwashed impurity, then the impurity is considered cleaned or diluted to a point where its impact will be considered negligible. Secondly, it is a kind of impurity which dries off after some time, therefore there is no need to bother whether this impurity has transferred to other places or not because after some time, it loses its ability of transference .