In my case I sent the Bitcoin Cash to an address created by a Mobile Bitcoin (!) wallet from btc.com.

The support from btc.com told me the solution:

B) You have sent BCC to your BTC wallet:

1. Use your BTC recovery PDF at https://bcc-recovery.btc.com/ (click on 'forgot password' to use your backup PDF)
2. Recover the coins to an address from your BCC wallet

There was not even the need to click on "forgot password". I just logged in there with my username and password of the mobile Bitcoin (!) wallet and then it started to scan so some addresses - and actually found the address I had send the bitcoin cash to. It then allowed my to specify another bitcoin cash adress where to send the money to.

So, I am lucky now, I have back the bitcoin cash the I thought I would never see again

In my case I sent the Bitcoin Cash to an address created by a Mobile Bitcoin (!) wallet from btc.com.

The support from btc.com told me the solution:

B) You have sent BCC to your BTC wallet:

1. Use your BTC recovery PDF at https://bcc-recovery.btc.com/ (click on 'forgot password' to use your backup PDF)
2. Recover the coins to an address from your BCC wallet

There was not even the need to click on "forgot password". I just logged in there with my username and password of the mobile Bitcoin (!) wallet and then it started to scan some addresses - and actually found the address I had send the bitcoin cash to. It then allowed me to specify another bitcoin cash adress where to send the money to.

So, I am lucky now, I have back the bitcoin cash the I thought I would never see again