Ok, so here's the deal.
Yes, the FOM specifically says cleaning is not required while on duty.
However, in the the spirit of the CARING and INTEGRITY VALUES, BlewJet has fostered--actually, intentionally created--an adversarial relationship between FAs and pilots by planting in their impressionable heads that the pilots are expected to assist with the "Blew Turn" and that the pilots aren't living our faux values if they do not assist. This, in turn, leads to a breakdown in CRM and safety by creating an us versus them mentality which is completely unnecessary and unavoidable.
It is this peer pressure that leads normally rational non-juicers to don the gloves and dumpster dive in back. (I facepalm so hard when I see a lanyard-wearer playing janitor in the back. You expect it from the juicers, but f#*k, come on man!)
So you're right, it is not a codified requirement, but a de facto one in the eyes of everyone but those of us who are familiar with the FOM language.
Just another example of how utterly fake and fraudulent the "core values" are.