Catching Bubbles

We had Ruby and Eric today as well as Harriet and Isabella. Lots of playing outside in the nice weather, cloudy and lovely sunny intervals.
We've got those long tubes with bubble liquid in them with long, elongated, oval shaped thingy's which makes the bubbles. It soon runs out, and some gets spilled, but washing up liquid and some water is just as good. We use 'Ecover' so that the bubbles are environmentally friendly.