A mechanic recently performed a vehicle repair for me. After he was done, he took a rag, sprayed lots of WD-40 on it, and rubbed it onto several of the hoses in the engine compartment (ex. power steering hoses) to clean them off and make them shiny.
I directed him to stop, because I had no idea if that's okay for the hoses.
Is it okay to wipe rubber hoses with WD-40?