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Yoshi76
I have used both
bitmixer.io and SharedCoin (from
blockchain.info -- I believe you must have one of their wallets to use their service) many times). Both services work well.
"They say" that the algorithm behind bitmixer.io does a better job of mixing the coins (making the links between your sending and receiving wallets harder to detect).
Carefully follow bitmixer.io's instructions!!It is better to test with a few btc before sending large amounts.
Be sure to be able to access the forwarding adress !