I've found LPS2 to be very effective. It leaves an oil residue which I usua lly clean off the exposed surfaces at least. It never become conductive but if dust sticks to it the dust might be conductive.
It also lubes the shaft. It has some component that are volatile but have s uch a low viscosity that you can literally shoot it on the front at the sha ft and bushing and it will penetrate and clean the pot. However that is mes sy and wasteful, and the shit is not cheap.
Going in from the front works sometimes because when you clean a pot you ar e actually cleaning the ring to on which the center part of the wiper slide s, not the resistive element around the perimeter. Usually.
On some pots that are tough jobs it helps to push on the shaft while turnin g. If it has a thrust washer that can collapse it increases the pressure an d facilitates better cleaning.
People say WD-40 is the same but it is not, LPS2 is used in the aerospace i ndustry for maintaining jets and whatever. One thing about it is it has a v ery unique odor that sticks around for some time.
Best price I found on it was at Zoro.com. I don't know if they ship interna tionally. Not to discourage you from them, they are suspect in sending me b edbugs which were hell to get rid of, so get rid of the packaging right awa y just in case. IF I order from them again I will unpack the order outside. but the price was very good on that. I don't really know about anything el se they sell, I needed the LPS and got it.
There is a very good product here called Deoxit which is good if the proble m is oxidation, which it is many times. However it is so expensive it warra nts taking the pot apart and using a Qtip to apply. Caig either makes it or distributes it along with actual cleaners, all not on the cheap, but good. I don't know if anyone ships you your location though.