Messy Mat and High Chairs

I love my messy mat, it saves my carpet from the every day food fights. I went and bought a length of vinyl from the shops and it has been my saviour ever since. What I don't love is cleaning the high chairs after this event. Who thought a piece of toast could get stuck there? I need to figure out a way to take the cover off and wash it. Who knows what is breeding? Perhaps a whole menu?