Omg how do I trade away Joe Johnson?

Okay here's my roster:

C:Yao Ming (Traded with C.Webb and Mcdyess)
PF:Elton Brand (Traded with W.Herrmann and Hamilton)
SF: Tyshaun Prince (I used to have Iguadola here but i traded him away along with Billup for D. Wade and M. Almond)
SG:Joe Johnson/D. Wade (Omg I traded Rasheed for Johnson because I needed a SG when I traded Hamilton now i can't get rid of him)
PG:M. Almond (The D. Wade trade)

Bench:
SF:A.Morrison
SG:D. Wade/ Joe Johnson
PG:K. Snyder
SG:Dupree
PF:Maxiell

I kept trying to trade away Joe Johnson but I can't get rid of him, I tried getting rasheed, Billup and Iguadola back but it didn't work out, I tried going for K.Martin they said they're not interested. Give me some advice please! Johnson is 85 and I want to trade him for a PG or SF.

Limit your prospective trade partners to teams who have high interest in him and preferably are struggling. Teams that are winning are less inclined to mess with their roster unless you're offering them a trade that is ridiculously in their favour.

thanks Andrew