how to remove dried/ stubborn/ ingrained blood stains?
stubborn就是顽固的意思，ingrained根深蒂固的，大意就是比较难处理的。
新鲜的血渍立马用冷水冲洗，然后用肥皂或者洗衣液揉搓. Don't use hot water, otherwise the stains will set in the fabric. 如果用热水的话，血渍就会牢牢地扒在衣服上面，反而不容易冲洗掉。
那么如何处理那种干了的血渍呢？ 用双氧水处理。
首先用冷水浸泡一夜，然后在有血渍的地方涂上双氧水，静置五分钟，然后揉搓冲洗，这个动作反复重复几次，直至血渍消失。然后正常放在洗衣机里清洗即可。
The most effective method is to use hydrogen peroxide, an oxidizing agent that removes old blood stains via a chemical reaction that breaks down the discolouration. While it’s safe to use, hydrogen peroxide can cause discolouration to some fabrics and can irritate skin, so always wear gloves, test on a hidden area first and check the care label to make sure it’s suitable.
词汇讲解：
双氧水的化学式 H?O? ，hydrogen 氢就是H。oxide 氧化物： "compound of oxygen with another element.
peroxide: per (large amount 很多) + oxide (oxygen氧)。 过氧化氢就是hyddrogen peroxide. 氧化剂就是oxidizing agent.
discoloration 褪色= dis (off, away 去掉)+ color (颜色)+tion (构成名词的后缀)
How to get dried blood out of clothes and sheets
- Remove any solid deposits using a blunt knife or spoon.
- Apply a small amount of hydrogen peroxide directly onto the stain.
- Leave it for five minutes and then blot with a paper towel.
- Rub gently with a clean, damp cloth until the stain is gone.
- Rinse the area with cold water until all the hydrogen peroxide has rinsed out.
厨房里面用小苏打或者醋也能很好地去除污渍。
Can vinegar remove blood stains?
If you can get to the stain before it sets, remove blood stains by pouring full-strength white vinegar on the spot. Let it soak in for 5 to 10 minutes, then blot well with a cloth or towel. Repeat if necessary, then wash immediately.
blot是擦拭的意思，重点在吸。
A baking soda paste (two parts baking soda to 1 part water) is also a good trick to help lift blood stains. Apply the poultice directly to the stain and leave it for up to 30 minutes. After you've removed the paste, carefully blot the area with a damp cloth or paper towel then wash as normal.
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