Homebrew PCBs

> No one is health friendly! :D
> 
> Even scrubbing is not health friendly as toner itself is declared as
> cancerogenic. So if scrubbing work (work for me) then use that and
> watter.


No it hasn't.

Breathing it in as a powder won't do your lungs much good, but that applies to just about everything.  Dust in bad, be it toner, sand or sawdust.

Scrubbing the fused stuff off a board won't do much.

Tony