It really depends on what it is made of and whether or not the weights are removeable. My son's weighted blanket is made of a fleece-like material and the weights are removeable, so I just take the weights out and wash it like anything else.
If you can't take the weights out, then you may have to just spot clean it with a mild detergent; something that won't make him sick if he chews on the blanket should you not get all of the detergent out.
This is probably a dumb question, but, if the blanket isn't a homemade one, didn't it come with washing instructions? If it did and you lost them, why not call the company you got it from and ask them what the preferred cleaning method is?
at 9:46 PM on Sep. 21, 2009