Phoenix, I only washed my cloth nappies in soap nuts and had no issues with absorbancy. I often added 1 tbsp of bicarb soda if I was worried about stinky stuff, and as long as it wasn't nappies, I would add a tsp of vinegar at the end if needed. But I love washing with soap nuts! I get them from the markets near my house and get a big box for $20, they last me two months depending on how much washing is needed.