Just because it appears clean, that doesn't mean there's no bacti present.
Mice aren't sterile, I get it.
But eggs contain lots of things that are harmful if left to reproduce at room temp.
Soda and eggs are both perfect foods for bacti, pathogens, yeast/mold, etc to colonize and reproduce to harmful levels.
We do ATP swabs at work and any residue will be picked up by those swabs and recorded as a failure.
We can't let failed equipment be used for food, so it gets cleaned again, until it passes.
If we cleaned with soda, it just wouldn't pass. Ever.
If you must clean it with soap and water as nanci does, it will work in the short term, just clean it immediately after using it, let it dry out, and store it in the fridge in a clean ziplock.
It's really not the best though. It would be better to clean and sanitize it with something like hydrogen peroxide (Using a syringe to circulate it.), dry it well, and store it in the fridge in a clean ziplock.
It would be even better to use it and throw it away, and next time use a new one.
I'm not trying to be a jerk, it's just that I would hate to see festy fight so hard to survive and succumb to an infection that was caused by poor sanitation of husbandry equipment. In his weakened condition it's a problem he doesn't need.
If organic matter was allowed to dry in the tube, it should be considered a biofilm, and no longer be considered clean-able.