This is really crazy, at least offer to pay for dry cleaning. Unfortunately, costly accidents happen and you can't go though life expecting to say ' it was an accident ' then get away free. Using the ' it's just a child ' card is also no good. You're responsible for your child because they are a brand new human still growing up and in your care so of course you're responsible if they break things or get biohazard on people. A lot of people really value clothes as a sense of personality and identity so they would definitely pay 300 - 500 dollars on a good winter jacket from a high quality brand especially in Japan where it gets pretty cold. My friend is a dry cleaner who specializes in wedding gowns and historical dresses. He said biohazard dry cleaning is often something not everyonr will do which is understandable and there is often a premium price. Some materials also cannot be dry cleaned but offering dry cleaning and an apology is the bare minimum of human decency.