You did great! You could even put a little more water in if you wanted. Was the water luke warm? That would be the right temp....not cold to make your baby cold, but warm so she is comfortable. I use baby shampoo, but I think what you used is fine, too. If you want, you can use an old tooth brush to scrub the quills a bit. Other than that, I do it exactly like you! Sometimes, I hold hedgie right under the tap to get the soap off quickly and well...the force of the water gets deep into the quills to get out the soap. Great job!