Good tip. Have you noticed any swirls/scratches left by the compound? I've also used 3M Finesse-it to remove hard water spots - much less cut than the heavy duty compound and worked very effectively. For a sealer, take a look at Aquapel. Forms a bond with the glass that lasts a lot longer than a RainX application. I've found that RainX needs to be reapplied after a few washes, especially in salt water conditions.
There's also a very effective 2 part system that I can't remember the name of. Part 1 is like a liquid compound that you apply with a scotch brite type pad, then wash off, and part 2 is similar to Aquapel in that it forms a chemical bond to the glass for a water repellent finish that is supposed to lasts at least a couple seasons. Maybe someone can help with the name.
Mike
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