What is the collective noun for washing?

There isn't a specific collective noun for "washing". However, you can use other terms depending on the context:

For laundry:

* A load of laundry

* A basket of laundry

* A pile of laundry

For dishes:

* A stack of dishes

* A sink full of dishes

For other washing:

* A batch of washing

* A cycle of washing

You can also use more descriptive phrases like:

* A mountain of laundry

* A never-ending pile of dishes

* A thorough washing of the car

Ultimately, the best term to use depends on the specific context and what you want to emphasize.