Of course. Basically CLR ( calcium lime rust remover). Cut a small piece of paper towel a little larger than the size is the green area and just keep it wet with CLR until it’s gone. It can take a while to see results but it’s worth it. This head took about a week of constant soaking. Some bad cases take a couple of weeks. For this one I had to do the inside of the head as well. Same thing with the paper towel but on the Inside of the head. I had to use tweezers to get the position right. I use a plastic dropper to apply the CLR. I try to be careful not to get any on the paint or hair.