How to clean a musical pull cord toy?!

[pipsicles]

This might seem a strange question, but does anyone have any advice on cleaning one of those soft musical pull cord toys? My DS has a jellykitten zebra and at 7mo, it now seems to be one of his favourites. He loves to have it when he is sleeping, but as it has been dropped on the floor, pavement, road etc countless times, I really feel that I ought to clean it. The tag says surface clean with a damp cloth, but I'm concerned that won't be enough. Has anyone been brave enough to submerge? Did it still sing afterwards?!