I have a Alky Control set up on my GN and I am getting some discoloration around the lid of the reservoir. I had the same kit on multiple cars and haven't seen this before so I am not sure what is causing it. The system has only had about 1/2 gallon of meth ran thru it so far and it looks like maybe some meth leaked around the lid and the reservoir has a very light green discoloration where it touched the outside. Anyone else seen this or know what causes it?