Yes ... you just cut the cappings off .. some warm water (not a huge amount needed and not hot - just warm) - I've used a soft paintbrush in the past to agitate the cells to help the honey wash out. You don't need to get every last drop out the bees will clean the corners before the queen lays. Save the washings with the honey and feed it back to them - if they have a surplus of food and they need the comb they will use it to build out any foundation - the alternative it to make a litre of two of mead !