Hello. To combat water shortages, I start collecting rainwater. I have a request, especially to "chemists". I have a 1000L Mauser tank, but the sticker on it says that there was a Rodine XL 1110 agent in there. I was looking for information about it and it is generally some sort of pickling agent. It has the inscription "corrosive" and the marking "Corrosive". What to rinse it with to be able to safely store rainwater that can be watered vegetables. Thank you and please help.