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Message: <blockquote data-quote="typo" data-source="post: 3161566" data-attributes="member: 83808">Damian,To my mind the ROR appears to be the more effective product of the two (I prefer the dropper). I was asked to clean 70 years of accumulated grime from a neighbours WWII RELs and the alcohol hardly made an impression but the ROR cut through it beautifully. However, the alcohol spray I use more generally for my specs, monitor screens and so on and it has the advantage that it's usually cheap. One thing I learned from the lab is that a single solvent won't dissolve everything so I think it's good to have a couple of choices to hand. It reduces the temptation to rub a stubborn smear harder.David</blockquote>