Graduates are just for mixing, IMHO. I rinse well between chemicals. I mix fixer by the gallon and use well washed winshield washer gallon jugs for storage. For film, I mix developer stock solution by the quart or liter, and use Di Saronno Amaretto bottle for storage. I just like the looks of them. Developer is diluted to working solution just before use and then discarded.
Keep everything washed well and you'll never have a problem.