There are 4 primary ways to make soap: Cold Process, Hot Process, Melt and Pour and Rebatching. Rebatching soap or hand milling soap is the act of reprocessing a previously made batch of soap. You are probably wondering why anyone would consider making soap by this technique? Well according to Soap Making Essentials, a soapmaker would consider the rebatched process of making soap to use up leftover soap bits, to repair a batch of soap that is short on ingredients or just plain ugly or to economize on expensive essential oils. ie. rose absolute.
In the article Rebatching Soap Instructions from Soap Making Essentials takes you the various ways you can make a bar of soap through the rebatching process. The article discusses two ways that you can rebatch soap - The Crockpot Method and Boil-n-Bag. The author of this article says that the crockpot method is much easier than the standard stove stop process or the oven process. As of the Boil-n-Bag method, the author is great because you don't have to worry about scorching and there is very little clean-up and recommends that you use a small amount of soap scraps.
So if you have rebatched soap by either of the stove top or oven methods and you have not had success, then you may want to try these two new techniques. Or if you are trying this method for this very first time, you may want to either of these. Give it a try and let us know how it went.