3 of my 4 girls have/had it. I have not treated the car seats yet, b/c I'm not sure how. All information I have says to wash on super hot water and dry on highest heat. That can't be good for a cover, right? I also have a spray that I can spray on the cover as well. (I know not the straps, but I'm not worried about the straps). Waiting to be cleaned is an EFTA cover, a Turbobooster cover, and a Nautilus cover. I sprayed the head rest and seat where my oldest rides in a NBB with the spray. Should I just spray all of them and call it a day? Or risk washing/drying? (line drying is also not an option, it hasn't been about freezing here since before Thanksgiving, and won't be for at least another month).