Dust, gritt, and cleaning my enlarger?

I'm using a medium format capable enlarger for my 35mm B&W printing. It is quite old and has a lot of dust all over. My prints are coming out with hairs and dust particle images on them now. What is the most effective way of cleaning the delicate glass surfaces, etc. There is dust all through the focusing bellows. I tried to give it a clean , but to no avail.....

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