Hello friends. I have 1 70's gas insert that has worked ok for the 6 years we have owned our late 40's home. Today I noticed on the faux logs and underneath where the controls are some stuff that looks like large pieces or flakes of lint. It looks like lint but turns to powder when touched. It almost resembles like a rat chewed through the top and stuff is falling down on top of the faux logs. What could it be and what should I do? I have had the fireplace on now for about 2 weeks and just now noticed it today. Thanks!