On a practical note, wash the tennies in warm water and soap in the washing machine when you throw the clothes in... Then set the shoes in the window sill to get dry, that will get the PO oil off of it and dry them back up. I do this with Juju's shoes when he does the same, shoes are fine. I actually wash all his sneakers (even leather ones in the laundry once or twice a month). Keeps the stink down! See you soon?