That's a good question. If you're only using a set of sample holder plates for a single person and you're only using saliva in them, you should be able to keep using them a number of times. You just need to clean them thoroughly with a high percentage alcohol. JW has mentioned that cleaning with water repeatedly isn't optimal and recommends alcohol.
For more details, please check the link:
https://www.spooky2.com/forums/viewtopic.php?f=115&t=9815
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