When and if you remove the gear cover, spray the gear with brake cleaner then lay a straight edge across the housing base, with marker draw a line across the gear put an up arrow on it, then you could even remove the gear. Cleaning the RTV would be easier that way.
EDIT: Stuff a rag in the gear hole, keep that RTV scrapping's out of the engine, it will plug up the oil cooler tubes, not good on the filter bypass either.