If it is a metal fixture, you can attempt to use a propane torch (with caution to protect any flammable items around your working area. How to Remove Plastic Nuts from Your Toilet Tank Step 1 Unless you want to dip your hands into a wet tank, shutting off the water supply for the toilet is very important. Spray the rust remover on both rusted bolts. If the chain breaks, you can get a new one at a home improvement store. If you do not have hydrogen peroxide, you can also use water to similar effect. Grab regular white vinegar and baking soda. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/8\/81\/Remove-Rust-and-Corrosion-Step-1-Version-2.jpg\/v4-460px-Remove-Rust-and-Corrosion-Step-1-Version-2.jpg","bigUrl":"\/images\/thumb\/8\/81\/Remove-Rust-and-Corrosion-Step-1-Version-2.jpg\/aid396190-v4-728px-Remove-Rust-and-Corrosion-Step-1-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"