Spraying standard WD-40 multi-use product into a toilet bowl or tank offers very limited utility and can cause problems. While it can temporarily displace moisture on metal flush linkages or quiet a squeaky flush handle, WD-40 is petroleum-based and will degrade, swell, or dissolve rubber components like tank flappers, fill valve seals, and wax rings over time. Furthermore, it leaves an oily residue on porcelain that attracts dirt and fails to clear mineral scale or clogs. Verification: Avoid using petroleum lubricants on rubber plumbing parts and use silicone-based lubricants instead if lubrication is needed.
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