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We warn against using Milton's fluid in our instructions (big warning sign on page 28). It contains a very agressive form of Chlorine.
Use our Chloramine T instead. It's perfect. Sterilizes instead of disinfects and is very, very cheap.
If the needles are still sharp, you can still use it. But the tips may have been eroded by the Chlorine. Test it. If it hurts and is hard to get the needles in, the Miltons blunted the needles.
Miltons is for plastic and glass.
Even though "Chloramine" points to Chlorine, there is very little free chlorine in a Chloramine-T solution. Exposure time of half an hour is more than enough to completely kill all organisms and the needles remain unscathed.