[header] How to wash a blanket [title] Fill a tub with cool water and add detergent. [step] Find a tub or basin large enough for your blanket to fit in and fill it up with cool water. Mix in mild detergent and let it spread through the water. 
You'll essentially be doing the same thing as a washing machine on a gentle setting, only manually, which gives you greater control over how the blanket is treated and helps ensure that every part gets clean. [substeps] Don't fill the tub up too much or it may overflow when you put the blanket in.