datahub, remove processed canonical and raw items after publication?

I have this question.

Once raw and canonical items have been succesfuly published into hybris from the datahub, is it recommended to remove those items from the datahub? My understanding is once both set of item types has been processed, they are ignored on any further datahub push event, so old data does not interfere with new data being pushed and processed by the datahub.

I am correct?