Expert remote

[AllenB]

My remote works fine clock-wise (volume up) but 'skips' on anti-clockwise (volume down), as if the little cogs (presumably) inside are not fully engaging. Not all the time, but most of the time.

Is this dust or dirt in the mechanism, or has my remote become faulty. Is there a way to clean and or inspect the inner workings and bring it back to full working order?

Thanks
Allen