Hello, dear customer. This is isolated, but the rust will occur under any circumstances. Here are three methods to remove the rust: The first method is coarse salt with white vinegar and half a cup of water. Bring it to a boil, and after boiling, clean the rust—it should come off, God willing. The other method is white vinegar with lemon and half a cup of water. After boiling, wipe the rust off., God willing. The next method is coarse salt with lemon, regular white vinegar, and half a cup of water. Bring it to a boil, then clean the area. I pray to God that I have succeeded in solving the problem. Thank you.