engblom, what do you consider a low cleansing bar? 10 or lower on soapcalc?
The cleansing value at soapcalc.net is very naive. You should take it with grain of salt. Soapcalc is considering only Lauric and Myristic acids to be cleansing. They form the cleansing value by calculating how many percent of the fatty acids are either Lauric or Myristic.
For example coconut oil is having 48% Lauric acid and 19% Myristic acid. Thus they add 48%+19%=67% and then they say the cleansing value is 67. They completely omit Capric acid (6%) and Caprylic acid (7%) which are both contributing a lot to cleansing. One percent of Capric or Caprylic will cleanse a lot more than one percent of Myristic. 48%+19%+6%+7%=80%. 80% are thus highly cleansing. The rest of the acids will also cleans to some degree.
Look at this:
Caprylic is having a chain-length of 8
Capric is having a chain-length of 10
Lauric is having a chain-length of 12
Myristic is having a chain-length of 14
Palmitic is having a chain-length of 16
Stearic, oleic, linoleic, linoleic are all having a chain-length of 18
The longer chain, the heavier the molecule is. The heavier the molecule is, the less it is cleansing in soap. All of them will clean, but to different degree depending on the chain length. Thus saying that olive oil is not cleaning at all is false.
Also, the cleansing property is also affected by several other things:
1. Super fatting will steal some of the soap molecules to "dissolve" own fat. Less soap molecules are available for washing. Also the percentage of soap molecules goes down because of the fat percentage.
2. Adding salt will make a milder soap as salt prevents soap from dissolving into water. The more salt, the less soap in the water.
Doing anything of those will give a completely different cleansing property of the soap.
Those soap I am making all have less "cleansing value" than 10 normally but I am not looking much at that value at all.
So as conclusion: Do not look blindly at the cleansing value at soapcalc! The value is just plainly stupid, especially if you superfat.