How to get that very last drop of your facial foam

This is my almost done tube of facial foam.

Step 1 : puff the tube up so there is space for air inside. Step 2 : add water (the amount depends on how much you have left in the tube, trial and error is the only way. Always start very little)

Step 3 : close the lid and shake very well.

Pour out the soap, it should become a foamy fluid like this. You can now use this to clean your face!