Bitwash is most prominent, and oldest Bitcoin laundering market, and only safe laundering site on web that I know.
You can buy big amounts of coins from the people who don't want their transaction to be traced (mostly stolen coins or earned in illegal ways), for "clean" bitcoins.
Deals are made by sellers and buyers themselves, and forum moderators just handle the safe transaction for a fixed fee applicable only to "sellers".
All transaction are handled by moderators (manual escrow), with different wallet for every transaction.
And only transaction number that you'll have is from the website only.
This invitation is for "Buyer's account" ONLY!!!
"Buyer" means that you provide "clean" coins for a fee, which mean that you can earn enormous amount of "dirty" coins for smaller amount of clean ones.
There are not so many offers daily, but if you make a deal, earnings can be enormous (depending on deal that you made), but for example, you can earn even to 50 or 60btc from a single bulk transaction.
YOU CANNOT RESELL COINS ON BITWASH THAT YOU'VE ALREADY BOUGHT THERE, "CLEAN" COINS ONLY!