Something has been spilt on my bean bag and now I need to wash it. How do I go about this, as it will have gone into the beans, but is too big for my washer. Any ideas?

Normally the outer cover is removable for washing, the beans are encased in a internal bag.

As for washing the beans themselves, you should be all right leaving them as they are.
A simple deodorizer should do the trick.

If the spill is extreme and you need to air out the internal bag that contains the beans, hanging it up and setting that bag out in the sun for awhile or putting it in a dryer on a very low setting should do the trick.

As mentioned above, using a simple deodorizer might be something that you can use.

Thanks!