Among the results, 15 per cent of Kiwis said they had ruined clothes because they had mixed colours and whites in the wash.
A total of 24 per cent of participants admitted ignoring care labels and tags and washing all clothing items on the same machine setting.
Nearly a quarter of people surveyed did not know that the insides of a washing machine had to be cleaned.
Auckland participants were most likely to use hot water for hygienic reasons - as were Cantabrians - while 20 per cent of people in the Bay of Plenty had ruined clothes because of mixing colours and whites.
Thirty-three per cent of people in Hawke's Bay did not know the inside parts of a washing machine had to be washed and those in Wellington were least likely to have ruined their clothes by mixing colours.
Up to 4 per cent of people from the Manawatu-Whanganui region said they had, at some point, left their clothes in the washing machine only to find them later and had to re-wash them.