Bad Horsie mabe needs cleanin?

[El Chiguete]

So I bought a used Bad Horsie wah yesterday and I've never played one befora but I think that t neads some cleaning for all the dust that maybe has inside. Are all Bad Horsies have a vere small travell of wah? I don't get a full wahhhh sound on the travel of the pedal, maybe just starts to make a different sound at half way down and it's very sencitive at the end (making just small movements at the end to make the wah sound). I don't hear a smooth wah range on it, kinda a bit cracky, like if it was a dirty vol knob.

What do you recomend me do?