On a tangent, here&#x27;s a youtube clip of cleaning and re-coating an 8 metre mirror.<p><a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=CkV8RRRu7gE" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=CkV8RRRu7gE</a>