Cut your soap base into small cubes, so that it's easier to melt evenly. (Melt in microwave for 30 second intervals until there are no lumps)
I used 112g for this recipe (you can double the quantity for more frosting).
Once your soap is melted, spray with rubbing alcohol to remove any bubbles.
Add about 2tsp of shower gel or liquid hand soap and stir
Using your hand mixer, mix the melted soap and shower gel for about 5-6 minutes on low speed.
The consistency that you're looking for should be similar to cake frosting!
This is perfect!
Transfer your frosting to your piping bag and try to be as fast as possible! Melt and pour does not allow for much time until it starts hardening again.
As you can see, the frosting pipes smoothly and has a soft texture :)
An example of how soap frosting can be used to decorate your soaps! :)