What is the difference between Cidex Plus and Cidex OPA?

The cystoscope is suppose to go surrounded by the Cidex Plus and the ENT Scope is suppose to go contained by Cidex OPA?
Why do they have to use both kind..instead of just one?

Answer:
I know Cidex OPA does not own glutaraldehyde (ortho-phthalaldehyde instead) while Plus does. That could have something to do near it. Perhaps the possible sensitivity of the different tissues to each chemical.
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