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Did your period come unexpectedly and now you've got blood stains on your clothes? Always use *cold* water to rinse, and often that'll be sufficient on its own to remove fresh stains. It has to be cold. Here's why...
Blood - and most secretions from the human body - contains a lot of protein. The body in general has loads of protein in it, and blood is no exception.
When exposed to heat, such as by rinsing in hot water, blood "cooks". Think about how an egg white is clear-ish, then once it hits the heat it almost immediately goes white and changes texture. The same happens with blood.
Meanwhile, rinsing your bloodstained knickers or sheets in cold water won't affect the proteins - it'll just rinse the blood right out!
This works best if the stain is reasonably fresh. Once it dries out, the blood will clot and this, too, helps it to bind to the fabric like applying heat.
If you'd like to learn more about what's in period blood now you know how to get the stains off your brand new white trousers, here's a primer... https://masto.ai/@vagina_museum/112892387509272810
And finally, the same principles apply to cum. Just in case any of you need to know that.
arc) @vagina_museum yea I mean it's just 
when you get in a hot shower and scramble some into your body hair
@vagina_museum And to sweat - apparently it has a number of proteins in it.
@vagina_museum this should be taught at schools as soon as boys age into double digits
@ehproque @vagina_museum i would think most children have been exposed to bloodstains long before puberty. If they've ever spent any time playing outdoors, on a playground, etc. Certainly I learned about washing out blood in cold water before age 10.
@hyc @vagina_museum oh I want talking about blood!
The @vagina_museum is a gift to humanity. There is very little as aggressively body and sex positive as them, and it is such a gift and a light right now. Y'all seriously need to follow them.
@vagina_museum I’m lucky enough to have a mother who taught me this as soon as I reached an age where that was useful to know.
@feorag @vagina_museum I learned it young - prick your finger stitching, blood gets on your needlework, spit on it or dab it with cold water quickly!
@vagina_museum At which temperature is the limit? Important to know to what temperature to set the washing machine. I'd assume everything <42° should still be safe, since these are valid body temperatures?
@Xjs @vagina_museum
Best to first soak and rinse blood stains in cold water and then put in the washing machine at normal temperature. If it's underwear, the hot wash destroys some other stuff you don't want lurking.
@OskarImKeller @vagina_museum The question remains, what’s normal temperature. Also, does it really? Isn’t soap/detergent enough to kill lurking stuff?
@Xjs @vagina_museum
With "normal" temperature I meant the one you would use for the fabric. I wash all towels, cotton underwear & bedsheets at least at 60 degress to kill everything that soap alone won't.
Running a higher temperature once a month also helps to keep things from growing in your washing machine.
There are special rinses for delicate fabrics which can't be washed at temperatures over 30 degrees. I have used them when we had scabies, noro virus or fungal infections in the family.
@OskarImKeller @vagina_museum I wash almost everything (except towels and bedsheets) at 30° anyway because the label says so. Wondered whether that’s cold enough to be able to rinse blood out, too. (But of course much easier when it’s fresh.)
@vagina_museum Another substance that benefits from cold water washing is milk. Rinsing out milk bottles with cold water is far more effective than using hot. I suspect that doing this for lactation leakage would also improve things
@vagina_museum I remember reading a long time ago that freezing clothing with blood stains would help remove them.
@vagina_museum Cold water with a little salt. To not burst the red blood cells with osmotic shock.
(The term to Google is "normal saline")
@vagina_museum this is very useful information! Thanks
@vagina_museum so the proteins in the blood denature? BTW Oxiclean or another sodium percarbonate bleach can remove blood stains.
@vagina_museum I have read this like a zillion times and I don't get it. Hot water works much better, especially on old stains. You can see it dissolve the blood in front of your eyes.
@RachelC_Y @vagina_museum Hot water will wash away clumps of dried blood but not the blood stain itself. The blood stain will be cooked into the fabric.
@bougiewonderland @vagina_museum That's what everybody says but I used hot water on white underwear and they became stainless, while no amount of cold water would do anything.
I just don't understand why everyone would keep saying something that just doesn't work. It's weird.
Anyway 
Whatever works for you
@vagina_museum there is also enzyme powder you can buy, it helps remove biological stains.