I started my old BSA yesterday, as there's little else to do at present. All went well until I let a microfibre cloth touch a very hot chrome exhaust. The result is a mess. Looking on the 'net there's a variety of solutions, ranging from wire wool (Eh!?!) to oven cleaner or vinegar. Some recommend heating it back up and wiping with a pure cotton cloth. I just wondered if anyone out there has successfully dealt with this, without damage to the metalwork. Thanks