Sugarsoap is a combination of chemicals. It includes Sodium Carbonate, Sodium Phosphate and often Sodium Silicate as a slight abrasive. The combined mixture looks like sugar. When mixed in water, it produces an Alkaline solution which is excellent at
cleaning paintwork before repainting.
I did a quick search on Wiki and it seems you may have a different product that is called sugar soap.
A similar product is TSP, or Trisodium Phosphate which is more likely available.