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.
[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.