Seen a large dairy flushing the lines of teat spray units with hypochlorite dont ask me what it kills that teat dip doesnt.Our ambic teat sprayer stopped working in August, we were very busy with other jobs and it wasn't got looked about, scc and clinical cases have dropped a lot since then, they may not be connected but a huge coincidence surely. I wouldn't be brave enough to just stop spraying on my own bat.