[poizan42]

What's superstitious about that? Soap isn't made for human consumption, it seems prudent to avoid consumption unless proven safe.

[fuzzfactor]

Momma was the expert, it was always pure superstition for people to think they didn't need to rinse, not just once but multiple times.

In the analytical chem lab, you can get an idea how suitable pyrexware is for future use by mathematically considering the quality of the final rinse water, the effective dilution ratio, and the number of times rinsed.

[jongjong]

I should have said 'half-baked theories' or 'unfounded beliefs' instead of 'superstition'. Sometimes it's hard to find the ideal word.