Psssssst

Psssssst Instant Spray Shampoo is a no-water substitute for traditional shampoo, popular in the 1970s; its popularity was widespread enough that it is considered a pop culture icon. The Nanny season 1 episode "Maggie the Model" featured a character who modeled for Psssssst during the 1960s. It was produced by Woodridge Labs. Its history may date to the 1950s. The company recently began making Psssssst again. The back label of a recently purchased can reads: "Between Shampoos- On Camping Trips- After Sports When Ill Any time you can't use water. Psssssst is the convenient, quick fresher-upper for your hair."
The current cans have four letters S in the brand name; previous versions had five or six.