removable diy background?

so i recently have become a beardie owner, and while they are still in quarantine i have noticed they have a habit of pooping on their basking spot. now this currently isnt a problem but after our vet visit deems them healthy enough to be out of quarantine, i was planning on diying the background of their enclosure- which would include their basking spots.

so!! question: do yall have any suggestions for how to make the background easily removable for cleaning purposes? or just any tips for cleaning them while still in enclosure? ive never made the background myself so im not really sure how that goes!