The Mexico-based artist Ivan Puig clearly felt it a good idea, however - and sent a VW Beetle to the spa. Whether it emerged as a Porsche 911 is not known.
Automotive milk bath: The sinking Beetle of Ivan Puig
Milk makes you beautiful - as Cleopatra well knew, when she bathed daily in fresh ass's milk. But whether this approach works for automobiles, we're rather less certain...
More details at ivanpuig.net.