I needed something cheap and easy to etch my circuit-boards with. After some experimentation, I came up with a simple method to etch PCBs using "The Works" toilet cleaner. Before we start though, let me state that this is my first instructable, and I would like any advice you have. I am not responsible for any damage or injury you cause. This acid takes longer to work than most others, but it is less corrosive too. It took almost one hour to etch our sample piece. We are not going to etch an actual circuit, but test a sample. This can be used on any copper clad circuit board you want to etch.