Where you normally park the car at night do you notice any fluid on the ground? You could have a PS hose leak or a seal leak on the rack and pinion steering assembly.
Very difficult to diagnose with how you explained it.
Go to the mechanic that's done work on your car before and have them check...
Stunning results as usual and always enjoy your write ups.
Hopefully the owners of all the vehicles you detail will take the time for continued care after your work.
Killer results on an old german 'muscle' car!
Beautiful job on the paint and wheels.
The seat leather looked beat up, were you able to revive it?
That is a hot 911!