Bambus undertøj til herre – 3 pak bambus underbukser i sort/navy/grå

White bamboo clothing that has gone grey and the way back

Short answer: Grey whites are caused by dirt particles and limescale settling in the fibres. A wash with oxygen based bleach and the right dose brings back most of the whiteness without damaging the fibre.

Why white turns grey

Greyness is not a colour but a layer of microscopic dirt, soap residue and limescale that settles in the fabric. It builds up slowly over many washes, which is why you only notice it once you lay a new white item beside it. See bamboo bedding to compare against a new set.

What dark laundry in the same load does

If you wash white together with dark items, a small amount of colour comes along too, even from clothes that are otherwise washed clean. That extra colour lies on top of the dirt layer and makes the greyness more visible than it would be if the white had been alone in the machine.

The first step is dosing

Too little detergent leaves dirt in the fabric, and too much leaves soap residue. Both cause grey. Read the packet for what applies to your water hardness and follow it, since dosing is the single factor that affects the result most, regardless of how good the machine is.

Hard water needs more

If you have hard water, you need more detergent or a descaling agent alongside it, because the limescale otherwise binds to the fibres together with the dirt. That is often why the same washing routine gives different results depending on where you live.

The treatment that works

Soak the laundry in lukewarm water with oxygen based bleach for a couple of hours, then wash at the highest temperature the fabric can take. That also applies to bamboo bedding that has gone grey. Repeat once more if needed rather than turning up the temperature.

Avoid chlorine bleach

Avoid chlorine bleach, which weakens bamboo viscose and yellows it over time. Chlorine attacks the fibre chemically, while oxygen based bleach works more gently on the surface, and the difference between the two becomes especially clear after repeated treatments on the same item over several years.

How to keep white white

Always wash white on its own, keep loads small so the laundry can be rinsed properly, and skip the fabric softener, which lays a film over the fibres that traps even more dirt over time instead of keeping the fabric clean.

Daylight bleaches naturally

Dry outdoors when you can, since daylight bleaches naturally without any chemicals. See bamboo t-shirts for men and bamboo underwear for men, where light colours benefit most from that habit, because they show greyness fastest of all.