Normally, soap bubbles do not leave stains because they consist only of water and soap raw materials. ... Seldom do soap bubbles stain clothes that have never been washed before. Attention when using stain removers!
How do you get bubble soap out of clothes?
Rub the affected area with a bar of soap. Wash again. Soak the fabric in undiluted white vinegar for at least 15 minutes (no more than 30 minutes), until the spots disappear. Rinse the fabric when the stains are gone.
Why do bubbles stain?
The reason for this is that the commercially sold bubble agent is not made from regular soap and water. In fact it is often made with a type of oil which can lead to stains. By using degreasing agents and scrubbing away at the stain you should be able to remove most, if not all, of the bubble stain.