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Rat extermination + Insect obliteration

We seem to have recently discovered the presence of an intruder in our attic. Fecal examination suggests it is a rat. There also seems to be something else crawling/buzzing around up there. Great in number and seemingly enjoying themselves. I'm looking for someone that can help with both of the above problems, and ideally help with cleaning up any leftover bio-hazard ... House is a 60 year old bungalow with relatively easy access to the attic. Attic has wool (non-hazardous) insulation so its fairly comfy. Let me know if you need any more details. Thanks!