Some wools will felt and shrink when they are set in the sunshine, so it is advisable to dry the garment away from direct sunlight. I have a wool setting on my front-loading washer and I have never had a problem washing and spinning the water out of wool. Top loader washers use agitation to get clothes clean; top loaders use gravity and centrifugal forces, which are gentler on fabrics. If you have a top loader, it's best to hand wash and roll out the water with a towel.