We haven't been in TV long, so my experience is from prior homes I've lived in..
One product I have used is called Glass Wax (Glass and metal cleaner). Comes in a thin rectangular can and it is a semi-thin pink liquid with a strong chemical smell. You apply it with a damp sponge, let dry and then wipe off with a soft cloth.
I have used it on shower doors, glass and chrome. It seems to dissolve everything, leaves a nice shine and has a water-repellant property as well.
I can't say we get much soap scum, because we usually use liquid soap. Bar soap (except pure olive oil soap) was banned from the house as soon as our contractor told us it causes soap scum, due to the talc and other ingredients. So the Glass Wax, for us, helps to eliminate water deposits and makes the squeegee float over the glass nicely.
It should work well on soap scum unless it is really thick and old - and needs removal with a razor blade first.
I re-apply this product about 1-2 times per year. In-between that, I just use the squeegee and dry afterwards with a soft cloth, if I'm feeling persnickety.
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