Soap foam is such a fun and easy sensory play recipe to mix up. It can be whizzed up in minutes using only 2 ingredients, water and washing up liquid (dish soap), and it feels so soft and fun to play with. Soap foam can be made in any colour of the rainbow by adding a little food colouring. Playing with soap foam is such a fun sensory play experience for toddlers and preschoolers (and big kids too!) that is suitable for both outdoor or indoor sensory play.