Can't help you with the stereo noise. (26 years-old was a LOOOOOONG time ago
)
However, I have a '96 and have the exact same problem with the front washers. I usually use rain-x and don't seem to need the washers much, so I've never really looked into it. However, I always thought it was a priming issue. When you haven't used them in a while it takes forever to get fluid onto the windshield. Once it's working, though, it seems to be OK until it sits again.
Replacing the plastic hose from the pump to the jets should be fairly cheap and *may* solve your problem. Who knows, I may just try it myself!
