Fabric softener drawer of Hotpoint BWM129 won't empty?

Hi there -

As far as I can see, there is no way of removing the drawer of my Hotpoint BWM129 to clean it.

Over time the fabric softener compartment has become pretty gunky - I've tried my best to clean it with a toothbrush but it's not perfect - and now it has filled up with water and won't drain.

Without taking the drawer out, I can't see how I can get behind it to check the tubes. I have run a Maximum temperature wash and put some bleach down there but that hasn't worked.

Any ideas?