Eusebio's advice

Eusebio is our usual supplier. It is the place where I go to buy clay and tools for my small workshop. Ana, my teacher, also buys all the necessary materials at Eusebio's store. In fact, all the ceramists in this area of Andalusia go to see Eusebio from time to time and we always buy something.
Today I went to buy white clay and asked about a liquid that they usually sell that is used to prevent the clay from getting stuck to the mould.
He said: I don't have that right now, but you don't need to buy it. Just use some washing up liquid with a little water and apply it to the mould!
Easy and cheaper!!  Thanks, Eusebio!