remove rust?
Aluminum foil can help remove some rust from certain metal surfaces when used as a physical scrubber under appropriate conditions. That does not mean a ball of foil left in toilet tank water will remove rust or prevent stains.
Can aluminum foil help prevent hard-water stains?
There is no good evidence that putting foil in the tank prevents hard-water deposits. If mineral buildup is a recurring problem, use a suitable cleaner and consider investigating your water hardness.
Can foil balls stop a toilet from leaking?
No. Toilet leaks
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