The phrase "during clean up" is correct and usable in written English.
You can use it to refer to the act of tidying up after something. For example, "We all worked together during clean up to get the house ready for visitors."
About 810,000 barrels were collected during clean-up.
When asked why, he responded that during clean-up time, his classmate Lizzy had knocked over his blocks and that he felt "very frustrated" at the time.
CSD play predicted development of self-regulation during clean-up periods, whereas solitary dramatic play was negatively correlated with improvement in clean-up performance.
A mobile water treatment system was constructed for deployment to remote cold regions contaminated sites for use during clean-up activities.
Feldman, Greenbaum, and Yirmiya (1999) found, for example, that 9-month-olds scoring high on negativity who experienced low levels of synchrony in mother-infant interaction manifested more noncompliance during clean-up at age two than other children did.
Difficulty during clean-up and recovery lead to increased divorce rates and a spike in Posttraumatic stress disorder (PTSD).
And there's no reason that a child old enough to reach the counter can't be real help while cooking -- or at least during clean-up.
Gloves should always be worn during clean-up.
Being organized starts with knowing where things should go - this comes in handy during clean-up and helps you maintain order along the way, so that big clean-ups actually become less necessary.
During clean-up time, prior to taking the class outside, the teacher announced "I need an expert electrician to come and unhook the power lines".
