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In general it's best to clean the objective infrequently unless you get sap or pollen or something nasty on the coatings, whereas eyepieces need to be cleaned regularly to remove eyelash oils/dandruff which will damage the coatings.
If you have to clean use no pressure, don't overdo the cleaning fluid such that it gets past the side of the objective and distilled water will remove most deposits on objectives.
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