Tidy tasks classified wrong as Storage tasks

I have many bottles of polluted water lying around my colony, I want these removed as polluted water in the kitchen is bad etc.  I select sweep on these items.  In my priorities windows, I have all tasks set to disabled, except for Tidy tasks, this single task, on all duplicants is set to Highest.  Despite the tooltip explaining that tidy tasks include sweeeping. All my duplicants enter the Idle state, not clearing up any of the polluted water. 

Whenthe priority of tidy tasks is set to disabled and the Storage tasks is set to highest, the duplicants will then clear away the polluted water.

If Dirt or other items has been selected for sweep, the duplicants seem to sweep this up with no issue.