assumes the foil caused an improvement.
But a toilet flushing normally after a change does not establish that the change helped.
Other cleaning steps
A person may clean the toilet bowl, adjust a component, or perform maintenance around the same time they try the foil trick.
If the problem improves, it may be difficult to know which action made the difference.
Expectations
When people expect a hack to work, they may pay closer attention to improvements while overlooking unchanged symptoms.
This doesn’t mean anyone is being dishonest. It simply means
