I have one of these......

https://i.ytimg.com/vi/1VHkWsb9MY0/maxresdefault.jpg


The volume control wheel (at the side) has lost
all fine-tuning capability, and makes appalling
noises when operated as it jumps at random from
high to low volume.

Is there a fix; is it a loose connection, dust or
grit in the works? Should I just flush it out.

Otherwise the radio works well.