Wd40, lighter fluid or PlusGas , warm the lens with a hair dryer put it onto some kitchen towel on a hot radiator and drip a a little solvent around the threads and leave it to soak . It may take several doses to soak the dry grease. Gripping the lens with a piece of sheet rubber or a rubber cup used for opening jam jars works for me, gland pliers are a last resort.
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"Tea is surely the king of all drinks. It helps against the cold, it helps against the heat,against discomfort and sickness, against weariness and weakness". Heinrich Harrer.
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