best way to clean airstones ?

[Freeherber]

hi I bought 5 large round ceramic airstones 200mm wide
whats the best way to clean them ? only had them 2 weeks and they are already losing 50 % of the bubbles
any advice pls
fr

[brer]

Wire brush or scrubbing brush!

[Freeherber]

Tried that Still the same.
Was told to use muriatic acid. Ie. Brick cleaner. ?

[spliffy2007]

Stick a small screw driver into the white nipple on the air stone where you connect your air line to the airstone, move it back n forth and get rid of the mesh thats inside it, i use the same air stones and works for me, ive never scrubbed my airstones, but if you google how to clean airstones they tell you to boil them in a pot boiling water

[1ndica]

boil them. Last forever.