Start with the decision that matters
Sort black and very dark garments by care label, fiber, soil and lint behavior. New deeply dyed items may transfer color and can deserve separate early washes.
Choose the process
Turn suitable garments inside out and close fasteners to reduce surface abrasion. Use the care-label temperature; cool or cold water is a conservative starting point for many dark loads when cleaning needs allow it.
Avoid the common shortcut
Use an appropriate detergent dose rather than overdosing. Heavy soil may need pretreatment or a different cycle instead of more heat.
Finish and troubleshoot
Use label-approved drying and avoid unnecessary high heat, which can increase surface wear and shrink risk on some fabrics. Keep one canonical dark-clothes routine rather than splitting every black garment into separate generic pages.
Garment care labels, appliance manuals and laundry-product directions can be more specific than a general guide. Use them when they set a tighter limit.