Cable operated dump valves

What have you all found to be an effective preventative maintenance procedure to keep the cables pliable and easy to open/close? We'll be taking delivery of a new Redwood 38 GK at the end of June. This unit uses cable controlled waste valves as well. We'll be full-timing soon after, and I plan to keep the valves closed for daily living, then opening and flushing tanks when the BW tank reaches about half full. So this may be every 3-5 days - time will tell. I read about the problems people have, and just wonder if many could be averted by an effective regimen from the beginning. Thanks in advance.