Leave your knit to bathe in water and detergent. DO NOT machine wash or machine dry it. After the bath you can rinse it and lay it on a towel to dry. You can also roll the towel with the knit inside and press on it to get most of the water out :)
Though its better not to hang them raw (they will stretch out and look very long, nothing permanent though), I recommend folding them in half and leaving them on the low bar of a hanger.
Totally! As long as the string didn't break, it's all easy to fix. Simply pull the following tightened loops to even out the loops sizes. A video tutorial is available on my Instagram.