Airillusion, first...what kind of washer do you use? What water temp? What detergent? we can probably help you keep your white sheets white but need the answeres to these questions, also do you have hard or soft water?

You can probably find a color to hide the sweat stains, but sweat is full of yuck, so instead of masking the yuck, wouldn't it be better to get rid of it, than you know the sheets are clean. Lots of people here that will have great ideas on getting the stains out.

Mamapinky0, I really appreciate your response but unfortunately our situation is tricky at best. Cold water is the only option for our washing machine, we also don't have any other options than just regular wash (we live in a foreign country and have a foreign washing machine). We don't own the washer and can't replace it. Its a terrible washer that we hate but is something we can't do anything about. We can't move either (its just way to cost prohibitive and we only have a few more years left). And the dryer, its a combo with the washer and it does an even worse job of drying than it does washing. We do seem to have soft water though and I do have access to some American detergents thankfully. I use Tide Clean & Clear as I have sensitive skin that reacts to fragrances. I also have been adding Oxyclean (the fragrance free kind). I'm pretty sure I'm just going to have to live with masking the stains.

Hopefully you have a stove...you can heat soup pots of water to fill the washer....but first what country are you living in?

Still need to know what kind of washer you have? At least you have soft water, so we can probably help those white sheets...tide clean and clear?? What country are you in??

Airillusion..your problem is disturbing me...ok you have some sort of Tide and Oxyclean booster, and soft water..heat your water on the stove, get it good and hot, and have someone dump it into the washer..continue till the white sheets are covered, add the tide and oxyclean and let it agitate 5 minutes, than shut the washer off and let it soak overnight, in the morning continue the cycle, than repeat the entire process, again allowing them to soak at least several hours than complete cycle...try several rinses you can use cold water rinses, but i'd heat water again for one very warm rinse, if at all possible, hang them on the clothesline in the sun. I know this seems like a painful process, but what's your othet choices? The stains on your sheets are probably body oils built up and nothing short of very hot water is going to shift them.

I'm in Japan. I have a large sink in my washroom. I'll have to try the hour water soak in that, then move them to the washer. Unfortunately it is a front load washer/dryer combo so not sure how to fill the washer with hot water other than that. Unfortunately I have no back yard and just barely a balcony so likely no sun drying. I've been hanging my clothes on drying racks in the spare room. Yeah it's a tricky situation in general.

First, I'd try some good Japanese detergent. Detergents, like many other things, are tailored to their target market. There should be detergents especially for washing in cold water.

You didn't say which brand and model of washer you have. I wonder if you could temporarily connect the fill hose to a hot tab during the wash fill. You could also pour hot water in through the detergent drawer, while keeping the cold water faucet turned off until the clothes are saturated.

You can also put those white sheets to soak in the sink, use hot water,detetgent and the oxiwash you have..i'd also boil a large pot of water and add that..stir them around with a paint stick, don't use your hand lol..let soak for several hours drain, and repeat before you put them in the washer to wash...if that didntt get it all repeat process changing water and detergents once a day...ya its a process but so worth it to sleep on clean bedding