So as someone living off grid and making my own soaps, the detergents just kind of creep me out.
The most effective thing and pleasurable one for me is using used coffee grounds. They soak up grease, leave your hands dry, smells nice, gets ride of any odors and makes for a wicked compost. Nothing is wasted and it’s a pleasure to do. Ash is more work and needs water to rinse after, and me being ina dry climate, water. Ones at an expense.
Try it out and be amazed. Many cafes just throw out their coffee grounds, just ask and be surprised how happy they are for it not to go to waste