Innovative methods are used to build a solar powered drip irrigation system on the cheap. And in Hobart, the Waste Warriors clean the school - from the staffroom to the toilets - with natural cleaning products.
A robot arrives at one school, keeping the students entertained as it assesses and processes recyclable bottles and cans when they are deposited. Each school also has an individual challenge to support local native wildlife.
A setback with their mission at Berry Springs doesnt deter the WWs Jenny, Jayden and Max. In Fremantle Sinon and gang get into a pickle and in Tasmania Wash-Up Wednesday is a huge success.