Hey, wanna hear a making money secret?
First go to the grand exchange and buy 200 dry clay. You heard me right. Buy the clay.
Now go and make this clay soft clay with buckets or bowls in Varrock at the Eastern Bank.
Fill up the bowls or buckets by going to the fountain nearby filling the bowls up then banking them.
Make the soft clay and go back to the Grand Exchange.
Sell your clay and you will get twice the amount of money that you payed for them.