It's the same old stuff that we were fi nding in the 1970s: drinks bottles, household detergents, bleach.

He has also written about the dangers of household detergents, the depletion of the ozone layer, microwave radiation and electromagnetic fields from power lines.

By then, new developments and the later conversion of aviation fuel plants to produce tetrapropylene, used in household detergents, caused a fast growth of domestic use in the late 1940s.