Go to Changelly/Evercoin and prepare to exchange your tainted BTC for Monero (XMR).
When asked to provide a XMR payment address, go to XMR.to and create a new order for the amount of BTC that you would like to clean. Use a BTC payment address provided by your Whonix Electrum/Armory Wallet.
Now, give the XMR.to payment address to Changelly/Evercoin, and send your tainted BTC.
You will receive instant payment to your Whonix BTC Wallet. These BTC cannot be connected to your real ID/IP.
For slightly more robust protection, use Whonix Monero Wallet between Changelly/Evercoin and XMR.to. This is protection in case Changelly/Evercoin are colluding with XMR.to (unlikely).
XMR.to Hidden Service: http://xmrto2bturnore26.onion/nojs/