Same instructions both in the Cessna 152 and C172 POH.
C152. Page 8-8: Tie Down...Install a surface control lock over the fin and rudder.
C172 Same page - identical wording.
Cessna R172K...page 7-16...."In areas where high or gusty winds occur, a control surface lock should be installed over the vertical stabiliser and rudder.
Like policemen, CASA inspectors are never around when you want them...