Australia national parks are supposed to be pristene wilderness - but the truth is far less clean cut. From Nappies left on Uluru - to food scraps and even desks and chairs - our natural spaces are constantly needing a clean up. It's an expensive issue for parks staff - and a headache for locals - so what can be done about it? Featured: Brent Lores, senior ranger/active district manager Adelaide and Mount Lofty Ranges.