Removing Rust Stains

edited December 2021 in General

I've picked up a 2000L insulated tank that was previously used to store hot water.

The inside of the tank has a lot of rust deposits from the hot water. I've checked that the inner tank is stainless. The previous owners were using a cast iron water heater, hence the rust deposits.

I've cleaned up the stains on the outside using CLR and a sponge. I want to use CIP or hosing of chemical over the inside to do the cleaning as I don't want to get inside. The fumes from the CLR when doing the outside were bad enough.

Does anyone have any suggestions for chemicals or products I can use to clean the rust stains from the inside of this tank?

Once clean I will be using it as a glycol tank


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