Some stains need a garment-appropriate treatment before washing, but the treatment must follow both the textile label and the product instructions. Extra detergent in the machine is not a universal answer to a stubborn mark.
Understanding this situation
Consider what caused the stain and whether the fabric's colour or finish is sensitive. Applying an unsuitable cleaner can create a second problem that looks like poor machine performance. Do not mix cleaning chemicals or put solvent-soaked items into a washer; a laundry appliance is not a safe method of disposing of hazardous substances.
A useful next step
Record the stain type and any product already applied, and choose a permitted wash afterwards. Check the result before using any subsequent drying method that the garment allows. If many unrelated items develop new marks after a wash, treat that as a different pattern from one original stain surviving, and keep a clear example for the enquiry.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.