To use solid sweater soap, all you have to do is get a sink, tub, or basin full of water cloudy with soap before adding your garment, either by letting the water run over the bar or by washing your hands into the soaking water. Remove the soap, let your garment get all happy and relaxed for about half an hour with occasional gentle agitation, rinse, and block as usual.
Never scrub your knitwear directly, and if you're concerned about colors bleeding, soak those swatches before committing to a whole project!
Yup, we wholesale. Interested in selling our sweater soap in your LYS? Tell us more!