I have read this M.A. question: What are the ways to get sweat stains out of a Gi? My gi is at least two years old (probably a lot older). It is an Adidas J800 (do)gi.
It is 30% polyester (800 g/m² polycotton) and cannot be washed warmer then 30 degreed Celsius. I wash it after every practice.
I would like it to be more white. It does not have stains, it is just a bit off-white, yellow. I dislike it so much that I even consider to buy a new one. But on the other hand it seems a waste to me because the gi's fiber is still ok. It is just the overall color. Especially in the collar. It just looks unhygienic to me.
I have tried washing it with Vanish and some detergent which is especially for white clothes.
A new judo gi will be over € 150,- so I would like to take a good look at my washing habbits, because this is not the first gi that became 'yellow'. Below are pictures of my 'should-be-white' gi with the washing-description.
My other gi which is 100% cotton has the same look.
ps. my sleeves seem to became shorter too, so maybe I just washed it too much and I have to just buy a new one?
edit I have found this online source http://www.budogi.co.uk/judo-gi-care-instructions/ and I do not iron my gi and just hang it to dry. I use liquid detergent (sorry for dutch link). Can Fabric conditioner be the cause of this yellow color?