steigede: Well, you should at least use something like a carbon fibre brush for dry cleaning. But of course the crackling could just as well for example be caused by excessive static charge (which you could significantly reduce for example with a "zapper" like the Milty Zerostat) or by some form of contact/continuity problem.
Maybe you'd best first try a few of your crackling records on your dad's system: If these sound pretty much the same way there, but without the crackling, that would be a good hint that your problem isn't caused by a lack of cleaning.
Greetings from Munich!
Manfred / lini

