I have spun a lot of yarn since 1980 and Shetland wool is still my favorite. Shetland wool is not the right choice for everything. Frequently customers call and discuss their next project. I am usually able to suggest a particular fleece that will be best fit the requirements. This is a very personal decision.
Many hand spinners feel very strongly one way or the other.
I prefer to spin washed fleece because I feel it responds better, does not change significantly when washed later on and doesn t gum up my wheel. Generally, fine fibers are best spun into fine yarn. They can be plied if a heavier yarn is required. I find that a detergent, such as Ivory, Dawn or Sunlight works best. I fill my washing machine with warm water and add the soap.