So the shop has bought a bike wash machine, maintains it, repairs it when it breaks down and makes it available for public use for a small fee, and you want to dodge that fee?
+1 If you do not like it then do not pay it. Put the shoe on the other foot and then think about it. You would not be pleased if someone stole from you.
From the bikes point of view It would appreciate not being jet washed down I reckon. The bearings seal will keep most out but not a hope at 60 PSI.
Dirtworker/Mobi washer or just a bucket and brush.

