Unclog HP cartidge with bleach?!

[Parhs]

I have a hp 21 cartidge that i was given and was clogged. There was no ink flow..
After boiling,ammonia ,steam etc had no success. However i got a little ink flow..

I tried bleach mixed with little amount of hot water and it uncloged the print heads!
HP 339 became 100% uncloged for the first time.. When i bough it refilled it was clogged a little..
Are there any drawbacks of using bleach ?

 

[qwertydude]

Bleach is corrosive to metal. Not really a recommended cleaning material.

 

[sbrads]

It will clean things that nothing else will, that's true, as it eats its way through via a chemical reaction rather than dissolving blockages, but I wouldn't leave it in there for more than a couple of minutes before flushing.