Replying to @Buzyz It seems like every time I rinse a stain in a video I get a comment along the lines of, “Make sure to rinse in cold water or else it’ll set the stain”! I too was taught this lesson when it came to laundry as even most of the dry cleaners out there have heard of this ‘rule’. However, after doing a few hundred laundry detergent tests with cold, warm, and hot water, I wasn’t sure if it was correct. To find out if this laundry urban legend was true or not, I decided to test it. To do this I stained 4 cotton swatches with pig’s blood, grass, olive oil with turmeric, and tomato sauce. I let these swatches dry overnight before testing. Then I washed AND rinsed one in cold water, washed and rinsed another in hot water, pretreated one to ensure the stains were actually removed, and then DRIED a swatch in the tumble dryer for 20 minutes and then washed on warm. Turns out that hot water DOES NOT set stains, but HOT AIR does. This is likely because the hot hair is removing moisture from a stain. Anyways, this is GOOD NEWS!!! I hope you found this useful #mythbusting #laundry #laundrytips #STEM #mythbuster #urbanlegend #explained