The soapstone tile one the right front, above door, is discolored. The one on the left isn't. Anybody else get this - I assume from smoke coming out when opening the door. I did do a dollar bill test when I first got the stove and could pull it out at that spot. I didn't think it was a problem but now wonder if some smoke does leak out there. I searched the archives and found one entry that says to use ooo steel wool. Is that still the way to go?