are there any other saved networks showing in your 'Manage know networks' list before you run Custom Clean?
R: Yes, before I execute the Custom Clean there are other networks on the list. Since your last reply I have executed the tool twice and the result is the same: all saved networks are deleted, except the network to which I am connected.
But as far as I am aware the network still has to be within range for you to do that, otherwise you just get a "Couldn't add the new network" error:
R: I have 2 routers at home, one of them with both 5.8 and 2.4 GHz networks, the other one with only 2.4 GHz. Besides those network, it is common for me to work on the go, so I had added the hotpost information for my 2 mobile phones, besides all the networks that I had used before (my laptop is about 6 years old) and all of this was deleted since the some time I executed the Custom Clean a couple of months ago (I have used Ccleaner for over 10 years and I never had this issue before).
Best regards