Some centuries ago there were no cleaners and bleaches that exist today. Still, all the nobles, brides, queens, dukes, etc. always wore amazingly white clothes. So how did they get that gleaming white in those years? The solution is simple. They washed the clothes with H2O2 (hydrogen peroxide). Hydrogen peroxide (H2O2) was produced almost in pure state in 1818 by French chemical Louis Jacques Thénard by reaction of barium peroxide (BaO2) with nitric acid. Thénard then improved the method by replacing nitric acid with hydrochloric acid and finally with sulfuric acid. With this solution, they washed the clothes and then dried in the sun where any debris evaporated.