I recently bought a Jobo processor which came with a set of used chemical bottles. According to the markings, these bottles have been used for E6 and C41 process, though I don't think they've been used in several years. At the moment, I only process B&W, and would like to use these bottles so I can use tempered water and chemistry. Is is possible to clean them entirely, or will the chemicals have worked their way into the plastic? Am I better off buying new bottles for B&W, and keeping these aside for when I get into E6 and C41? I'm not even sure if these are available new these days.