Saves COAL ........

.....every wash day.  Now that dates it :-)
Born in 1908 - Rinso was a market leader in the world of washing powders, but in the 1950s Tide came along and decimated Rinso sales.  Rinso disappeared from UK shelves in the mid 1970s (although it is still sold in Asia, Turkey & Central America).
This old sign  is at Oakworth Station on the K.W.V.R.