The toys I'm playing with are getting weirder over time

@fuxoft That's the "clean water" part, why would you want to clean that out?

To get remains of the water (with detergent) out, I just poured some fresh water in, and turned it upside down over bath. There's a nice channel at the top near the opening (well, bottom when you turn it upside down) to guide the water to the opening.

@fuxoft @michal Mine has two detachable compartments, I clean both of them after each use. Because the detergent is being added to "clean water" compartment.
@wilbury @michal I am unable to clean the second compartment (where the detergent is being added). Are you able to open it??
@fuxoft @michal yeah, I am. obviously it depends on the type of the machine. some have both containers detachable, some not, it seems.

@fuxoft @wilbury My set apparently has this self-cleaning attachment.

It sucks the clean water out and also cleans the hose so it doesn't have residue inside.