Thought about buying new washers and bolts for it, but also just tempted to flex seal around the bolt heads and be done with it. And with the corrosion comes a brittle cake-like brown cap that sits on the bolt head. I have replaced them twice; I see no water leaking what so ever or smell. Underneath all of that rust are the heads of the tank bolts. How to Remove Rust From the Inside of a Toilet Tank. Rusting toilet tank bolts can be surprising. I checked the other two toilets in the house and they’re more normal. Add a new metal washer to secure the tank to the toilet bowl housing. To keep life simpler in the future, here are some steps to keep the tank in a better state of cleanliness day in and day out.. Start by draining the tank. Many homeowners across the United States battle against hard water in their plumbing … Underneath all of that rust are the heads of the tank bolts. You and your helper can now raise the toilet tank back over the toilet bowl housing and reseat the bolts and central tank … When you have loosened the rust and hard water build-up, rinse the area with water. Rusting toilet tank bolts can be surprising. Probably a product of ... Why I am curious is that it ain't rust. Toilet Forum discussions: TOTO WT153M DuoFit In-Wall Toilet Tank - washlet outlet cap jammed: Dec 17, 2020: Toilet Forum discussions: Air flow in toilet tank: Dec 8, 2020: Toilet Forum discussions: Mansfield Toilet Tank Question: Nov 14, 2020: Toilet Forum discussions: Side inlet fill valve on high tank toilet running: Sep 13, 2020 Kohler toilets, the heads of the 3 brass bolts that hold the tank to the toilet are corroding badly. Scrub stubborn stains with a brush or sponge. Let the CLR solution soak for about 2 minutes before rinsing and flushing. There is a little gap between the bowl and tank even when the bolts are tightened down so not sure why that is. Either you didn’t realize it, or you noticed a drip which caused you to look at them. I was going to replace the bolts and washers but the nuts are completely seized and rusted to the bolts. Due to placement I can only get about a 1" draw on a hack saw (which doesn't really cut well) so I can't easily cut them that way. Spray CLR directly onto rust stains and mineral deposits. Step 6 - Reattach the Tank and Refill. Repeat until the stains are gone. KEEPING THE TOILET TANK CLEAN. Sometimes during a quick adjustment, you lift the lid of the toilet tank and you see two giant balls of rust. Then, replace the washers and nut on the second bolt in the same order. Keep the brush wet; have a bucket of warm water handy. Apply CLR to the sides and bottom of the toilet tank. Sometimes during a quick adjustment, you lift the lid of the toilet tank and you see two giant balls of rust. The bolts that hold the toilet bowl base in the floor keep rusting away on me. 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