Why is Dawn dish soap bad?

Online Answer
The Environmental Working Group gave Dawn a 'D' grade because of it containing methylisothiazolinone, which is a "High Concern: acute aquatic toxicity.
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Yes, Dawn dish soap was the soap to save many birds and seals. In fact, the ingredients are so effective that it removed the grease and never harmed the birds or their skin. Dawn is so important that it effectively raises money for many wildlife groups.
Dish soap does get rid of germs and viruses Dish soap's main function is to get grease and food residue off of your dishes. ... Like hand soap, dish soap does not kill bacteria, but it lifts them off surfaces so that they can be washed away by water.
Dawn wrote the VERIFY team, "None of our Dawn dishwashing liquids contain ammonia. However, you shouldn't mix dish washing liquids with any cleaner, including bleach." ... So we can VERIFY bleach and dish soap are a toxic combination. According to the Texas Poison Control Network, if you are exposed, it could kill you.
Dawn and vinegar work wonders for that extra smudge-cutting and cleaning mixture. Mix in a spray bottle 1/4 cup of white vinegar with 2 and 1/2 cups of water, plus 1/2 teaspoon of Dawn dish detergent. Rinse windows and mirrors with clean water to clear off any suds.
Add equal parts Dawn and vinegar to a spray bottle and shake gently to mix. If you have really tough deposits, you can heat the vinegar in the microwave before mixing for a little extra power. Spray all over the tub/shower and let it sit for a few minutes to a few hours, depending how yucky the target..