I've found that Savon de Marseilles is absolutely the best. This is a French olive oil soap whose ingredients are (supposedly) governed by French law. Perhaps they were in the time of Louis XIV. I'll bet they didn't have coconut oil for foaming action at the court of the Sun King. The combination of olive oil and coconut oil in the current commercial product seems to just suck all the grit and grime out of my hands. I do a lot of stainless steel buffing, so my hands get pretty dirty. Don't confuse Savon de Marseilles with Aleppo Soap. This is pure olive oil soap and not very good soap at that, as the quality of most Middle Eastern olive oil is pretty inferior. It's the combination of olive oil and coconut oil that seems to do the trick. BTW, don't use French olive oil for cooking. It's decidedly inferior. Use only Spanish or Italian (preferably Sicilian) olive oil.