This is the education kit I bought in the Imperial World school supply shop. It makes liquid for cleaning plates and dishes. Lots of ingredients, I'm not really sure what the liquid in the bottle is, the Thai lists it more as 'base' than anything, perhaps glycerin? It's quick to mix and yes it does work as a soap. You can see at the end I washed some dishes with it, and it did take off the grease.
It cost me 110 Baht, about $3. You can see the kit below, mostly powders and one bottle of liquid and the little bottles are food colouring and lemon smell.
I don't know how much a child would learn from this kit. Not without a teachers guidance too.