Hi, has anybody ever rented a booster seat from National? The kids are two big for the 5point harnesses so their boosters would have to go through as checked luggage and we were hoping to avoid that. What condition were the seats in, cleanliness, ect.? What did you do to disinfect the seats? We were thinking of maybe taking a sheet and then cutting holes for the straps if needed? Thanks for any info or suggestions.