Yes. It is possible to build any requests like this into the offer to purchase and it will likely be received more amicably under the current circumstances. Buyers have the right to ask that the property be cleaned and that the seller pays for it. If the seller refuses the request, buyers have the right to postpone their move-in date so enough time will pass and the virtuality will be diminished. Essentially, they would wait until any “leftover virus” to diminish in virility before exposing themselves to the property.