Wooden combs are very difficult to get smells out. Anything that will take the smell out will probably cause damage to the wood. You might try taking the harmonica apart(disassembling same) and burying it on just dry baking soda. After a while (check to the absence of smell) brush it off with an old shaving brush or and old tooth brush. Then use a spray bottle of 90% pure alcohol... Grain or ethanol and then dry the comb with a hair dryer to get the moisture out as quickly as possible. The reed plate can be soaked in a mixture of 1 tblsp of dish washing detergent like ajax or dawn (BTW the same product with a different scent and colorant) for a couple of days and then lay the plates down flat and softly brush any gook off of them, one side of each plate and then the other side of the same plate. When both plates are clean rince them in warm, not hot, water. Take a paper towel wrapping the plates and patting dry gently. (the proceedure for cleaning the reed plates is the same regardless of what the comb is made of.)Now simply reassemble the harp.

If the comb is plastic you can use any number of agents to clean it... Soaking in alcohol or detergent water and brushing it with the old tooth brush will clean it and a spray of alcohol will dissinfect the comb. Rinse with warm water and dry with a towel or paper towels. The final step is to reassemble. If the harp is old enough to have nails holding on the reed plates and cover plates you should probably get some screws for the reed plates (they are self tapping and you may need to drill the holes in the top plate before putting the screws down through the newly drilled out holes. The bottom will usually accept the self tapping brass reed plate screws.)The cover plates will need to be drilled to accept the cover bolts and nuts.

Using 90% or higher alcohol (some homemade alcohol products are higher in alcohol content) will kill germs and even virus' on both the cover plates and the reeds. Simply spray on and into the holes wipe the cover plates and tap out the holds to clear most of the alcohol. I spray my harps after playing them and wipe them down.. Keeps them looking new and clean...Alcohol has a small amount of fusol oil in it so it acts as a lube on the reeds as well.

Hope this helps..

Rayzor