From the Manufacturer

Our music shop specializes in hand-made harmonica.

Harp are generally considered clean before the first use, Unless something drastic happens to dirty the instrument, the only cleaning it should need would be an occasional wipedown with a clean cloth or paper towel.

If you blow saliva or food particles into it, please holding it in one hand, hit the palm of your other hand with the side you blow into using adequate force to dislodge the foreign substance. Then wipe it clean.
The harmonica is a free reed wind instrument which is played by blowing air into it or drawing air out by placing lips over individual holes (reed chambers) or multiple holes. The pressure caused by blowing or drawing air into the reed chambers causes a reed or multiple reeds to vibrate up and down creating sound. Each chamber has multiple, variable-tuned brass or bronze reeds which are secured at one end and loose on the other end, with the loose end vibrating and creating sound.
Reeds are pre-tuned to individual tones, and each tone is determined according to the size of reed. Longer reeds make deep, low sounds and short reeds make higher-pitched sounds.

Our harmonica the pre-tuned reed can be changed (bending a note) to another note by redirecting air flow into the chamber.

The harmonica has other nicknames, especially in blues music, including: "harp," "blues harp", "french harp", and "mouth organ."