What causes liquid detergent streaks on darks?

Detergent streaks or residue on dark fabrics can be frustrating, but they typically stem from a few common laundry practices. The primary culprits revolve around how detergent is dispensed, dissolved, and rinsed from the clothes.

Too Much Detergent

One of the most frequent reasons is simply using too much detergent. Modern concentrated detergents and high-efficiency (HE) washing machines require far less product than older machines or conventional formulas. Excess detergent creates more suds that can redeposit onto fabrics, especially dark ones where residue is more visible.

Cold Water Washing

Another significant factor is washing in cold water. While energy-efficient, cold water can make it harder for liquid detergents to fully dissolve and disperse. Undissolved detergent then adheres to clothing fibers during the wash and rinse cycles.

Overloading the Machine

Overloading your washing machine prevents clothes from moving freely, which inhibits proper agitation and rinsing. This means detergent can get trapped in pockets or folds of fabric, leading to concentrated streaks. It also hinders the water from adequately flushing away detergent residues.

Dispenser Issues

Sometimes, the problem lies with the washing machine itself. If the detergent dispenser is clogged or dispensing too slowly, the detergent may not enter the wash cycle at the optimal time, or it might clump and stick to the first items it touches, leading to streaks.