Try using the copper wire cleaning sponges that you can purchase at any grocery or hardware store. I use these on all of the little openings around the plumbing. I also stuff these products in the slide corners on my last 5ER. Worked great mice will not chew through copper.
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Jim W.
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67, TDR 145K+miles
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