I just soaked it in vinegar for a night and in the morning I woke up, the vinegar turned blue, the copper parts were rough, when I wiped them it gave off a yellowish-brown colour and now its stuck with this greyish copper colour. And I was so stupid that after giving them a wash I forgot to dry them it started looking like the statue of liberty.
Any suggestions how to clean this up and remove the roughness? Why did this happen?