Reusing cubes with cleaning agents

[perko8]

Hi everyone,
I've got access to a supply of 15l cubes which have had NaOH in them - actually have about 700ml still in the bottom.
It's a commercial dishwashing machine detergent/dedicated with a couple of other low concentration ingredients - Disodium metasilcate and tetradosium EDTA. The NaOH is 51g/l.

From what I could find online it seems they are all water soluble.
So, my question is - do you think it would be worth rinsing and using for brewing purposes or just turf them?

I know it's not much to get new ones, but free is free...

 

[manticle]

If rinsed thoroughly, the caustic should be ok since it can be used as a vey effective brewery cleaner.

Other ingredients listed - not sure. Main concern after toxic residue (presumably not an issue considering its use but please check) would be fragrance.

 

[Grott]

No, and I would suspect they are not food grade. Free is free but cheap ones, food grade are better value.

 

[perko8]

I'll do a bit more research, but might skip it. Perhaps what's left in them might be usable as a cleaner for brewing which would be something

 

[manticle]

Still fragrance

 

[Markbeer]

I tried this once. And only once.

The fragrance you can never seem to get out.