63d2328e_rication___Australian_Robotics__Sources
[Description] Non-Scratch Scourers* [3] Supermarkets and elsewhere [Sources] 
Used to remove paper burrs from the PCB prior to etching, also good to use to clean the PCB prior to etching and used to remove the Toner post etching. See - Handy! :)
PC to PCB in under 30 minutes - Quick 'n Easy PCB Fabrication | Australian Robotics
Sources