I had a question about some corrosion on my toilet water supply line. I've provided a picture below.
What I was wondering are a few things.
1) What is the reason for this? Why would a valve start building up corrosion while my other bathrooms do not.
2) Is it something I need to worry about and replace or can I just wash it with some solution to remove the corrosion or if I don't replace it will it cause a bigger issue down the line.