just a hint:
instead of spraying contact cleaner into a jack, directly use a Q tip dipped in Say deoxit , and insert that into the jack instead , it doesnt waste the excess cleaner and you control where the cleaner goes, an other option is to dip a 1/4 inch plug into the cleaner and insert that several times into the jack rotating it slightly to clean off corosion
instead of spraying contact cleaner into a jack, directly use a Q tip dipped in Say deoxit , and insert that into the jack instead , it doesnt waste the excess cleaner and you control where the cleaner goes, an other option is to dip a 1/4 inch plug into the cleaner and insert that several times into the jack rotating it slightly to clean off corosion