How do I get the red tint out of my hair?

I dyed my hair dark red last year, and wnt to dye it back to my natural color,blonde. I bleached it once, and the red didn't come out.. So I dyed it black. And a few days ago a re-bleached it to go blonde again and it still has a red tint, how do I get rid of it? And don't say a professional -.-