What had originally been used to bleach clothing before the industrial revolution?why did this change?

Stale urine was used pre-industrial revolution to bleach clothing, this changed probably because bleach was just a better alternative (sorry I don't have your full answer but there is the first part if you want it)

Explanation:

john maynard keynes developed new economic theories in response to the : b) great depression of the 1930s. his theories are so important that they are known as "keynesianism". in his works he supports the idea of a government with deeper involvement and intervention to end the great depression.