After the world started being aware of how badly it was polluting the world through industrial processes and started using scrubbers to help control the emissions, they found they produced so much H2SO4 acid as a byproduct, and treating the waste was costly, so to get rid of this waste they started finding new markets and uses to sell their waste, thus we have sulfuric acid-based drain cleaners and many other products now made and sold containing H2SO4 which is a product of pollution control...