Vinegar is acetic acid diluted in water. It's already pretty diluted and weak. I use it on the water spots around the faucets, takes awhile depending on the build up. No need to use distilled water, mix vinegar 1 part in 4 or so water to try. Maybe use a paper towel dipped in vinegar, diluted or not, wipe to see how it's going. Vinegar is a great cleaner. I just put in yesterday an electronic device, called a scale remover, that turns the minerals into substances that don't stick and wash away. Have to see how that goes.