How to best find where Power steering leaks

1957 Fairlane club Victoria. PS leaks, pricing out all replacement parts to make like new without knowing where leak is adds up to lots of money.. Id rather find where leak is coming from. How best way should I do this. It doesn’t leak much but it’s messy over months time like every 6 months I add fluid as necessary. For example, do I need someone in car to move steering wheel back and forth? Should I spray it all down with something to get absolutely clean to find leak.? Etc Never had to work on one before, Thanks appreciate. John