As a final note, if the concerns are "Germs" on the floors (or similar) then as an alternate solution, a good can of Lysol (or similar) can work wonders. Spray the floor/room as you are leaving for the parks (as the vapors of that stuff makes me gag) and feel safer when you come back that it killed all/most of those germs that you are concerned with.
As a final note, if most people really knew how many germs (at of what type) they come in contact with DAILY (touching , breathing, eating, etc...) they would probably never leave the bubble. Germs are a part of life. Just like criminals. They are there, we just try to avoid them, particularly the bad ones (like Mass Murderers). Can't avoid them all though.