How to keep whites white and stop blacks fading
By the Pacco Pacco Laundry team · Updated 18 September 2026 · 5 min read
The short answer
Whites go grey from being washed with colours and go yellow from body oils that cold, overloaded washes never remove, so wash whites separately and warm with enough detergent. Blacks fade mostly from friction and heat, so wash them cold, inside out, on a shorter cycle, and keep them off the harsh sun line and out of the dryer. Sorting properly is boring and it is also most of the battle.
Why do whites go grey or yellow?
Grey whites are usually a sorting problem: tiny amounts of dye from every coloured item in the load transfer onto white fabric, wash after wash, until the whole shirt looks tired. Yellowing is different; it's body oil and skin products building up in the fibres, most visible at collars, cuffs and underarms, because the washes weren't warm enough or the detergent dose was too light to remove them fully.
That means the fix depends on the diagnosis. Grey needs stricter sorting; yellow needs warmer water and better washing, not more bleach.
The whites playbook
Wash whites strictly with whites, including the almost-white greys and creams people sneak in. Use the full recommended detergent dose, wash at 40°C where labels allow, and don't overload the drum; whites need water and movement to release soil rather than redeposit it.
For dinginess that's already set in, an overnight soak in warm water with oxygen bleach (sodium percarbonate) before a normal wash revives most cotton. Sunlight is the old-school finisher: line drying whites in full sun bleaches them gently and it's free. Chlorine bleach is a last resort; it weakens fibres over time and yellows polyester, which is the opposite of what you want.
Why do blacks fade, and what actually slows it down?
Black garments fade for two main reasons: dye physically rubbing off through friction in the wash, and fibre damage from heat that changes how the surface reflects light. That faded, slightly fuzzy look on an old black tee is mostly abraded fibre ends scattering light, which is why no amount of re-dyeing keeps it looking new for long.
So the playbook is about reducing friction and heat. Wash blacks inside out, cold, on a shorter or gentler cycle, with liquid detergent rather than powder (undissolved powder is abrasive and can leave pale streaks). Keep zips zipped and wash heavy items like jeans separately from delicate knits so they don't sand each other.
Drying: where most of the damage quietly happens
The dryer is hard on dark colours: heat plus tumbling friction is exactly the combination that fades them. Line dry blacks inside out and in the shade; strong summer sun fades dark fabric noticeably in a single season of full-sun drying.
None of this needs to be complicated day to day: sort into whites, lights, darks; run darks cold and whites warm; keep both out of harsh heat. If sorting three ways is precisely the step your week doesn't have room for, that's the kind of preference you can set once with our wash, dry and fold service and never think about again.
Quick questions
Do colour-catcher sheets work?
They capture some loose dye in mixed loads and are useful insurance for lightly mixed washing, but they don't replace sorting. A red sock in a hot white wash will still beat a colour catcher.
How can I revive a yellowed white shirt?
Soak it overnight in warm water with an oxygen bleach powder, then wash at 40°C with a full detergent dose. Repeat once if needed. Collar yellowing that has been ironed in repeatedly may not fully reverse.
Does washing jeans inside out really help?
Yes. Most visible fading is surface abrasion, and turning jeans inside out moves that friction to the inside face. Cold water and skipping the dryer do the rest.
Is there a way to make faded blacks black again?
Fabric dye can re-darken cotton, but results on blends are patchy because polyester doesn't take standard dye. Prevention is far more effective than re-dyeing.