Ummmm I would say don't squeeze...especially in each of your cases where it sounds like there is NO need to (you can't see anything). Squeezing your pores can damage them, especially if you don't know what your doing...and I think most of us don't know exactly what we're doing
Also, naturally, your pores WILL have stuff in them, as your sebaceous glands are always producing oil so there will ALWAYS be something in a pore...a pore that's not producing oil actually, would be problematic!!! Your skin would be reptilian!! So I would rec. just a good cleanser, and maybe to exfoliate once a week...my advice is...don't over-do it...your skin is a fragile, delicate organ (yes, it's the largest organ of the body), and if it's not broke, don't fix it!