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A shop vac is you best option to clean out the fireplace and what you can reach of the flue. The type of debris you mention shouldn't be a hazard even if it does catch fire from your "log set" it will only burn briefly and won't get hot enough to be a concern. Your description of the "log set" indicates to me a low intensity fire which shouldn't be a problem either but you shouldn't burn anything else (like wood) in that fireplace until/unless you get the chimney inspected.