"Soiled insert" refers to an object or material that has become dirty or stained due to the presence of dirt, grime, or other substances. Full definition
No need to remove soiled inserts before washing... how awesome is that?! (thirstiesbaby.com)
Because the insert will agitate out in the washing machine, there is no need to remove soiled inserts from the diaper. (nickisdiapers.com)
Plus, there is no need to remove soiled inserts before washing, toss the Thirsties One - Size Pocket Diaper in the washing machine and the insert will agitate free during the wash cycle. (thirstiesbaby.com)