Problem: There are large amount of residue being trapped in the detergent bottle when the detergent is almost finishing .

Solution: Make changes to cap or/and spout to allow excess residue to flow out 

Changes made: 

Thickening the lower part of the cap for a better hand grip

Changes made:

-Shorten the out layer of the spout, leaving the tube at center to be exposed 

-Small hole being cut on the tube where the left over residue is being blocked to flow out