So, she puts "on a shower cap." A shower, "shower," cap, "cap," (two words) is a piece of plastic that you put on your head, and it covers your hair. You put it over your hair so your hair does not get wet when you take a shower. It's called a shower cap. Again, this is something that I do not need.
n. 肥皂
vt. 用肥皂洗,阿谀奉承