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I went to home depot and bought a spade drill bit and drilled them out myself in about 5 mins for each. Wear a mask and eye protection for the dust but otherwise super easy. The drill bit will go right through the cat material, there is some fiberglass and steel wool/braid inside as well but all come out super easy. Once you start drilling it will break into larger chunks just start pulling them out as you go. Don't need to make it all dust to get it out.
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