Dear OP, I asked a simple question out of my own curiosity, about what you are using in your tank. There is some difference of opinion and practice among those who clean LPs using US; some use surfactants and/or mild detergents and some use pure water, like you. So far as I know, there is no right or wrong answer to my question. If you find the question itself to be insulting or annoying, your skin is too thin to be posting here.
Also, it was your own words that misled me to believe you might be heating the water in your tank. Sorry about that, too.