NO, dont even try to take them apart, they are a precision piece of kit, dirt shouldnt have got inside the casing to affect the lenses, but if it has you may need to take them to a specialist in order to have them cleaned inside, i once tried to clean the inside of a pair of binocs , 70s era, the trouble i had was bloody awful, i learnt my lesson although i was very lucky that i eventually got the prisms inside to sit correctly after 20-30 attempts of taking them apart and reassembly but they were never really the same
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