My first try with milk soap was with goat milk. It was a pretty basic recipe, with only three oils (palm, coconut, and olive), and I substituted half the water amount for the milk (coz I kept scorching the milk while trying to add the lye into it! patience is not my strong virtue I must tell ya). After that, I moved on to coconut milk, then soy, cow, cream, etc. My fave so far is the three milks soap, which had goat, coconut, and yoghurt inside. Overkill? I don't think so. I've seen others do up to five milks in a batch.
Making milk soaps has an art of its own. It can cause overheating if you aren't careful, and when you HP it, it often gives you separation. But that's easy to tackle, you just gotta utilize the stick blender one more time till everything is nicely blended once again. You also want to make it as creamy looking as possible, and it can be hard with gelled soaps. Not a problem, a dash of titanium dioxide will take care of this problem nicely :D Yeah, I do cheat sometimes, ha!
One of my unscented goats milk soaps done in a fun, rabbit's head
Since patience is not my strong virtue, I rarely substitute the full amount of water with the milk. Half is enough for me coz it's more practical. Some say it's not a true milk soap if done this way, but I chose to disagree. We all have our own ways of doing something, and as long as the customers like it, then you must be doing something right with it.