THroughout the season I have used the TF100 FAS-DPD test quite a bit. There is a black film that has formed on the vial and I was able to get most of it off with just water and wiping it down good. It still looks stained. I have the same black residue over the spoon for powder.
Can I use MA or something else safely to remove this residue (more concerned about the spoon being dissolved)?
What is turing things black?