I'm not sure why you couldn't use the baby detergent for other clothes? A cousin was helping her daughter with the new DGD and got some food on her shirt. So she used the baby detergent on the spot - it worked great. She had remembered it was for washing dirty diapers so it worked great. I tried it and it was very good. I really like using it for towels.
Must admit it never occurred to me to not to wash the baby blanket in regular detergent - but then I usually use the fragrance free items because some of the smelly ones are too much for me to wear.