Once i heated it up i got a damp sponge and i wiped off the old solder. IIRC i wiped it off and then tryed to tin the tip again, but i saw my tip has turned black. I tried to tin it, but the solder just turned into a ball and rolled off the tip, as if the tip was oil and the solder was water. I tried taking off what i presumed was oxidation by cleaning it with the sponge, mr. cleans magic eraser, and my last resort was a nail filer. MR cleans magic eraser turned the oxidation a grayish blue, but the nail filer was the only thing that took off all the oxidation. (i know that any sort of abrasive thing shouldn't be used, but i was angry and confused). I felt pretty happy, but as soon as i put solder on the tip, the tip immediately turned black and the solder rolled off again, making tinning impossible.
I tried re tinning my spare chisel tip too and it wasnt so bad, but the solder just rolled off too. Now all i have left is a tinned "mini chisel" tip that im scared to use because i dont want to mess up what i have left.
Is there something im doing wrong? I could really use some help.