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It's not liquid, but it does everything you need. At least, you can't spill it, that's one advantage, not to mention, it's much more concentrated, something you require.
You can wash anything with it, so that includes body, hair, clothes and dishes, and household cleaning too. I brush my teeth with it when on a hike; it contains soda, so it's pretty good for this, though it contains glycerin which leaves an unpleasant oily later on your teeth, and has a quite special taste.
It is biodegradable, though it isn't 100% safe. No soap is, don't fool yourself, 'biodegradable' only means it breaks down into things naturally found, not that it doesn't harm anything.
It is highly concentrated, a cube lasts me and my GF a couple months, it's just 100% soap with a quite aggressive pH, so you can't really find better than this without harming your skin. Well actually, I hope you don't have a sensitive skin, because it WILL harm your skin. Same for brushing your teeth, it isn't for everyone either, as it may rape your mouth.
It's very, very easy to rinse. I can wash, rince and dry myself with the same microfiber towel, wringing it every time, which is quite handy; once I'm done, I wrap the bar in the towel, so it's covered with soap and the next time I'll only have to wet it to wash.
It's not antibacterial, but then, antibacterial soaps are actively harmful to nature and aren't biodegradable, so you can't get both. And finally, it has a very strong, bitter scent of olive, which feels very natural and blends well with nature's scents, but it doesn't stick anyway.
Now there are two of these: Marseille and Alep soap. They're very similar, though Marseille soap is more aggressive, Alep is softer but more scented. The hardest part is finding REAL, traditionally made soap, as you can find pretty much anything going by those names.
Both come in the form of pic related, brownish cubes, greenish when wet.
I spent a lot of time searching for soap, and it's the best one.
