Bubble

While in the village, Iris Wildthyme blew bubbles from a bottle of bubble mixture. (PROSE: The Party in Room Four)

Information from invalid sources
The Rainbow Dalek, a collaborative product from Dapol and My Little Pony, was advertised as coming with "soap and bubble action". One tester found that he was squirted in the face with soap and bubbles as the Dalek proclaimed "You will be washed!". (NOTVALID: The Year Ahead)