I am involved in some HPLC analysis, and to add the internal standards to my samples I generally use a Hamilton syringe for precision and exactitude's sake.
The thing is, I have found one of our syringes had developed important rust spots on the inside, to the extent of not being able to move the plunger at all. As far as I know, it might be someone used a chlorinated solvent (which decomposes giving some HCl as a result product), and did not clean it properly afterwards, which caused the rust.
Is there any possible solution to recover this syringe, or at least to be able to (re)move the plunger? (I have a spare which would fit)