Make them do things for you (Score 1)

Tell them you'll do support for them if they do your household chores for you. Might sound a tad mercenery, but from the sounds of it your effectively cleaning up their computer for free so why shouldn't they clean your house. Alternatively they might have skills you can make use of for example doing things such as proof reading in exchange for your services. This would free your time up to do the easy task of fixing their poorly secured systems.