Cleaning Issues

Thanks to the assistance you provided to me a little while ago I am trying to transfer a bunch of family videos that are on Mini DV to my computer via firewire cable with Win DV. My camcorder was stolen years ago so I borrowed a friend's camcorder to do this but I kept getting an "cleaning error." I purchased a cleaning tape and I also followed some clearing tips I found online. Nothing I did would get it work so I purchased a slightly used camcorder and tried that but I am getting a very similar error message. Every time I try to play a tape, I get a cleaning error message.

I am now trying to figure out what the issue is and what I can do. Is it possible two camcorders, even after multiple cleanings are still too dirty to play the tapes? Is there a place I could send it to to be professionally cleaned? I understand the camcorders get dirty from playing the tapes but can old tapes get a freshly cleaned camcorder that dirty that quick? Could the problem be with the tapes and if so, what can I do. It it possible both camcorders are no good which means I should return the one I just purchased and purchase another one?

I am divorced and my kids and I would really like to see some videos from they were kids but I have about 30 tapes and simple don't have a grand $$ to drop at Legacy box to have these videos transferred by them. ANY help, input or ideas would be greatly appreciated.

Thanks in advance.