An extra rinse is not permission to use more detergent. The starting dose still needs to match the detergent instructions, load, soiling and water conditions rather than the number of rinses selected.
Understanding this situation
An oversized dose can create excessive suds and make the programme work harder to remove residues. Adding another rinse after every wash may hide an unsuitable dosing habit without addressing it. Equally, detergent left on clothes can have causes besides dosing, including overloaded laundry or an incomplete programme, so the result needs to be described accurately.
A useful next step
Check the product's measuring instructions before changing the machine options. Record whether the residue appears on all garments or mainly inside folds, and whether the cycle finishes normally. Use extra rinse only where the garment and appliance instructions permit it. Do not repeatedly run a leaking or electrically unsafe washer to investigate detergent behaviour.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.