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Your blanket may have an outer layer to protect the inner weighted material. It will be kept closed by a zipper or series of snaps. Undo these and carefully peel the outer layer from the blanket. Use a gentle or delicate cycle with cold water.  Use a small amount of liquid detergent. This usually goes into the central slot of the detergent dispenser on a front loader. Avoid bleach or whitening agents.   Depending on its size or thickness, the cover may need to be washed by itself. Alternatively, you can wash it with a few towels to keep the washer balanced. If this is a first wash or the cover has bright colours that run, wash the cover separately in a cold, gentle machine wash with 1 cup of salt to set the colours. Set your dryer to low heat or air fluff. To avoid crumpling, remove the layer from the dryer before it has finished drying and hang it out to complete the drying process.

Summary:
Remove the outer layer. Put the layer in the washing machine. Tumble dry this layer on low heat.