Bottom line:  There is no evidence that cleaning the perineal area with chlorhexidine prior to catheter insertion reduces the rate of CAUTI.

Summary:  Identified documents using JBI+COnNECT (Joanna Briggs Institute)

Review of results led to CDC CAUTI guidelines, 2009.
Page 43 references two studies that found no difference between cleaning with chlorhexidine v. water prior to catheter insertion.  There are also studies referenced in that section that address intermittent care.

A systematic review of the management of short-term indwelling urethral catheters to prevent urinary tract infections
Page 702 – describes 1 RCT of 436 patients admitted to obstetrical unit who were randomized to periurethral cleaning with water v. chlorhexidine prior to insertion of catheter.  No significant difference in rates of CAUTI between the groups.

The RCT of 436 patients is also referenced in this best practice summary: Management of short-term indwelling urethral catheters to prevent urinary tract infections