This verse

"Oh! We never send clothes to be dry cleaned or pressed,
'Cos ether and alcohol are used in the quest."

Has the possibility of some scientific dating - due to the technical nature of the 'dry cleaning process'. The ' 'dry cleaning' may have been been a 'home done' process - the gradual tightening of the free availability of ether and 'untreated' alcohol' would be a note. Of course, if it is just satirical, this may not be relevant anyway.