To remove everything, wash away everything, wipe off everything, eat everything (on one's plate), etc.
The -an imp. focuses on removing s.t. The -un imp. focuses on consuming s.t. The pa--un imp. focuses on causing the object to be clean.
God said, "I will wipe away all life from the surface of the earth."
If you eat, eat all your food so none is wasted.
When we eat, let's eat everything on our plates.
We don't have much corn, but I'll give you all that I have anyway.