How to wash First Years bassinet

I got this second hand and it had a ton of icky little stains on it. I cannot believe a baby bassinet was made without a removable cover!
I sprayed Shout on the stains and soaked it in the tub with HOT water with 2 cups vinegar and 1/2 cup of Borax washing powder (baking soda works well too) I scrubbed the fabric w/ a soft brush and swooshed the loose fabric around in the water. Then I rinsed it in hot water and more vinegar to remove any soaps. Then I towel dried the fabric and set it up in the tub w/a fan on it ( I cannot leave it outside as I have 2 outdoor kitties) I did this at the recommendation of the nice woman who runs our local dry cleaner. It turned out clean and bright and totally stain free! You may want to wrap the handle in Saran Wrap and of course DO NOT submerge it completely. I did this and the light/music feature was dry and still works.

Unfortunately the manufacturer says that it is surface wash only - the cover is not meant to ever be removed. (Check out the original owner manual pdf here - page 12 gives cleaning "instructions": http://content.learningcurve.com/wps/wcm/connect/fd902d8049670b5da9b6ab3efa0f6b5d/3073.pdf?MOD=AJPERES). How dumb, huh? An infant bassinet with tons of fabric that grows dusty and occasionally spit up on, etc., and you can't remove and wash it? I have the same bassinet and the same problem - I'm going to try to surface wash some areas that need it tonight... We'll see what happens!