YT got me a shofar from Israel as a Christmas present. was so happy. but as you know, the shofar stinks...
" The reason that most shofars smell bad is that when they are clean at the factory they cannot remove all residues from the inside. This residue is sinew and flesh that is clinging in crevices and the smell is it decaying."
searched online on how to clean my shofar:

1)
You can start by gently scrubbing the interior of the shofar you can reach with a brush and water. A toothbrush will work. Rinse with water and allow to dry. Try to stand the horn upright, bracing it against something, so no liquid pools in the curves of the horn. Then follow with one or more of the following methods, depending on how the shofar smells after each cleaning.

2)
A little more aggressive approach uses aquarium gravel. The physical action of the gravel against the inside of the horn works to loosen and remove debris. Plug the mouthpiece gently with cotton, or wrap plastic wrap around the mouthpiece and secure with a rubber band. Take about a teaspoon of the gravel (not sand, and not the large rocks) and pour into the large end of the horn. Shake the shofar for several minutes. Pour out and discard the gravel. You can rinse the shofar with water, or again with hydrogen peroxide. Remove the mouthpiece covering and let the horn dry as instructed above.

3)
If there is still a lingering odor, again plug the mouthpiece as directed above. Then fill the shofar half full with hydrogen peroxide. Gently shake the shofar and allow the hydrogen peroxide the loosen any more debris.

Pour out and discard the peroxide. You can repeat this treatment several times. If debris is still coming out of the horn, you may need to repeat the gravel procedure again.

4)
A solution of several tablespoons of baking soda dissolved in water can be poured into the shofar. Block the mouthpiece as instructed above, and again, fill half full and agitate for about a minute. Pour out and discard the liquid. Rinse and allow to dry.

Borax can be used in place of baking soda. Dissolve in water and use the same technique. Borax takes longer than baking soda to dissolve completely. The physical action of the undissolved borax against the inside can help dislodge debris, plus borax is a natural deodorizer. Rinse well after pouring out the borax and allow to dry.

5)
If any odor still remains, a mild bleach solution can be used to clean the shofar. The concentration is 1 tablespoon to a gallon of water. Fill the shofar about half full, as with the hydrogen peroxide method, and shake the shofar. Pour out and discard the bleach solution. Wipe off any bleach that may get on the outside of the horn, and then rinse the horn with clear water. Again, allow the horn to dry in an upright position. It may take several days for the bleach smell to dissipate.

6)
A final method is to place the large opening of the horn against a runningozone machine. It can take anywhere from an hour to overnight to neutralize any remaining odors.

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After drying your horn thoroughly you must oil it. An anointing oil is recommended that contains myrrh which is a natural preservative. Pour a small amount of the oil in the bell of the horn and swirl around. You can also obtain a trumpet valve brush (buy at music store) to oil the mouth piece end.

sources:
http://www.shofars.org/cleaning_the_shofar.htm
http://www.ehow.com/how_5026191_clean-newly-purchased-shofar.html
http://www.ehow.com/how_5015645_clean-shofar.html