Use any detergent you'd like. Using a fabric-softener is recommended and will hellp you to keep them soft. Wash your kigurumi on "cold" for its first cleaning. This helps the color set it.
After the first wash feel free to use the "warm" setting in case your kigurumi has got stubborn stains. You can use the "normal" or "permanent press" cycle on your washing machine. If you're worried about your kigurumi, the "gentle" cycle should also do the trick. Using non-chlorine bleach is however safe. Chlorine bleach will damage the texture by destroying the fleece fibers.After the washing machine, you can either put your kigurumi in the dryer or hang it out to dry. If you hang it out to dry, be sure to keep it out of direct sunlight. If you use a dryer, we recommended using either the "air dry" or "fluff air" setting (with no hot air as it may cause shrinkage). To prevent wrinkles, take it out from the dryer and hang it as soon as it is done. Never iron your fleece kigurumi. It will lay the pile texture flat hence the beauty will be destroyed. And sometimes on holidays, because of the big load on the post offices, it can take a bit more. So, please do shop earlier.