Following fatbeeman's topic about rendering old comb. I was curious as to how others who run wooden frames but use plastic foundation go about it. I was "taught" to try and replace (brood) comb every 5 years or so, actually replacing 20% each year. The idea behind this is that most contaminants are present in the old comb/wax, the older the higher buildup levels. Another benefit, that by removing comb and actually giving the bees the chance to draw new comb, allows them to do something that is natural and necessary during a point in their lifespan. So back to my question. Most of my frames are wooden with plastic foundation. It is easy to just scrape off old comb. Is this enough or should a person remove the foundation as well, melt off every last bit, back to the plastic, and then rewax them by dipping in hot wax? (John Pluta video) Just give the frames a good scrape, pop in the rewaxed foundation and go, or should a person pitch the woodenware? While the comb may seem old and dark, the frames are in great shape.