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Need to replace rusted out toilet tank bolt. Anyone know what this stuff on top of it is? : r/Plumbing
![Toilet Tank Inside View with Rust and Calcium Buildups. Fixing a Toilet Cistern at Home Float Mechanism. Stock Image - Image of open, mechanism: 228644709 Toilet Tank Inside View with Rust and Calcium Buildups. Fixing a Toilet Cistern at Home Float Mechanism. Stock Image - Image of open, mechanism: 228644709](https://thumbs.dreamstime.com/z/toilet-tank-inside-view-rust-calcium-buildups-fixing-toilet-cistern-home-new-float-mechanism-toilet-tank-inside-view-228644709.jpg)
Toilet Tank Inside View with Rust and Calcium Buildups. Fixing a Toilet Cistern at Home Float Mechanism. Stock Image - Image of open, mechanism: 228644709
![Water with high iron content leaves rust stains behind in places like toilet tanks This one is an extreme example Stock Photo - Alamy Water with high iron content leaves rust stains behind in places like toilet tanks This one is an extreme example Stock Photo - Alamy](https://c8.alamy.com/comp/B57GHX/water-with-high-iron-content-leaves-rust-stains-behind-in-places-like-B57GHX.jpg)
Water with high iron content leaves rust stains behind in places like toilet tanks This one is an extreme example Stock Photo - Alamy
![Does anyone else have "small-scale" submechanophobia? Things like the inside of a toilet tank really freak me out. : r/submechanophobia Does anyone else have "small-scale" submechanophobia? Things like the inside of a toilet tank really freak me out. : r/submechanophobia](https://s3-production.bobvila.com/articles/wp-content/uploads/2017/11/How_to_Clean_a_Toilet_Tank.jpg)
Does anyone else have "small-scale" submechanophobia? Things like the inside of a toilet tank really freak me out. : r/submechanophobia
![Dirty Unhygienic Rusty and Calcified Flush Tank of Toilet with Limescale and Rust Stains and Scum Close Up Need To Be Cleaned and Stock Photo - Image of indoors, block: 158432716 Dirty Unhygienic Rusty and Calcified Flush Tank of Toilet with Limescale and Rust Stains and Scum Close Up Need To Be Cleaned and Stock Photo - Image of indoors, block: 158432716](https://thumbs.dreamstime.com/z/dirty-unhygienic-rusty-calcified-flush-tank-toilet-limescale-rust-stains-scum-close-up-need-to-be-cleaned-repared-158432716.jpg)
Dirty Unhygienic Rusty and Calcified Flush Tank of Toilet with Limescale and Rust Stains and Scum Close Up Need To Be Cleaned and Stock Photo - Image of indoors, block: 158432716
![Dirty Unhygienic Rusty And Calcified Flush Tank Of Toilet With Limescale And Rust Stains And Scum Need To Be Cleaned And Repared. Stock Photo, Picture and Royalty Free Image. Image 130624830. Dirty Unhygienic Rusty And Calcified Flush Tank Of Toilet With Limescale And Rust Stains And Scum Need To Be Cleaned And Repared. Stock Photo, Picture and Royalty Free Image. Image 130624830.](https://previews.123rf.com/images/realiia/realiia1909/realiia190900280/130624830-dirty-unhygienic-rusty-and-calcified-flush-tank-of-toilet-with-limescale-and-rust-stains-and-scum.jpg)