Please be aware Q45T is perhaps not best used as a contact enhancer on your expensive cables. You don’t even necessarily need to use it on the stereo. Just use it on the pins of a bunch of cheap double/multiple adapters, plugged into various wall sockets around the house. Just a very thin coat on the ac and earth pins. The best option is a multiple adapter strip, with all the outlets filled with dummy adapters (each treated with Q45T). No current needs to flow (but if there’s a switch it must be on).
(I'm assuming Q45T is what I think it is. I don't have any Q45T to check. But if it is black, oily and slightly gritty, then it is probably what I think. To be sure, rub a droplet between two fingers. If the grains start to disappear after about 30 seconds of rubbing, then it's what I think it is.)