According to superstitions, clothes washed on Good Friday will never come clean, a reference to the legend that Christ was slapped in the face by a wet garment while being led to his crucifixion.
Further superstitions are that one risks "washing away" a family member (causing the death of) or of finding one's laundered items spotted with blood.
Here's another superstition from Southshorenow.ca: Never wash clothes on Christmas Day because it is bad luck and it will cause a boat somewhere to sink.
There’s also a New Year's Day superstition, wherein you should not do the laundry, for fear that a member of the family be 'washed away' (die) in the upcoming months. The more cautious eschew even washing dishes.
According to Huffington Post UK, a survey has claimed that it's more likely that a person has faith in the supernatural than in religion, while more people believe they have "special powers" than those who regularly go to church. Find out more here.