I had about 8 swift microscopes like this. You could try a stronger solvent I read about using toluene or benzene to clean them, but I'm not comfortable using those in my sciecne classroom. I attempted acatone, but it didn't do much to clean them up. I ended up doing was ordering new 40x objectives for about $80 each. While that's about a third of the cost of the microscope, the micro...
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