What is drag-out?
Drag-out is the cleaning solution carried out of the bath on the parts and baskets and into the next stage. It is a triple cost: concentrate lost from the wash tank, contamination added to the rinse, and chemical load added to effluent. Dwell-and-drain time above the tank cuts it sharply.
Every basket leaves the wash tank wearing a film of solution, and blind holes and box sections carry far more than a flat face does. On a high-throughput line, drag-out can account for more concentrate consumption than the actual cleaning does.
The cheapest control is time. Holding the basket above the tank for 10–15 seconds to drain returns a large fraction of the film to where it belongs. Tilting or rotating the basket, and orienting parts so blind holes face down, compounds the effect.
Drag-out is also why the first rinse degrades fastest. A counter-flow rinse — clean water entering the last stage and cascading backwards — keeps final rinse quality high while using a fraction of the water.
