This was a job I really did not want to do, quite frankly I was terrified of getting it wrong and scratching the objective. My scope has been used very frequently in a variety of conditions, often quite dewy but also for solar so any dew marks have been well dried on! It was definitely due a clean, as you can see in the first picture; frankly I'm a bit embarrassed at how dirty it was! I sought advice from MikeDnight who pointed me in the right direction (cheers Mike!) so here's what I did..