Apart from a few simple principles, the sound and rhythm of English prose seem to me matters where both writers and readers should trust not so much to rules as to their ears. ↗
I'll look at the script and I'll try to find as many books, movies, and pieces of music that I think are going to feed each scene or the character as a whole. ↗
It was just using the liquid shampoo - the Russians have one very similar to the stuff we use on the Shuttle - you just wet your hair with it and then wipe it out. ↗