In my previous 'life', I was a Fleet Controller for Hertz and I have to say that as a total petrolhead it broke my heart to see the way the cars were treated. Having said that, the Alfas stood up to it pretty well, certainly far better than some of the others - Vauxhall, Peugeot and Renault immediately spring to mind on that score as far as things breaking or falling off and VW/Audi and Ford when it comes to electrical/mechanical glitches.
In terms of day-to-day care and maintenance, anything safety or function related was dealt with immediately (things like damaged tyres, broken lights, windscreen damage, warning lights) but 'cosmetic' dings and scrapes on the bodywork or damage to upholstery, carpets, door trims etc were only repaired (or should have been,
) when the car was defleeted.
If the car was leased, it would have the manufacturer listed on the V5, would be kept for no more than 6-8 months or 15-18k miles or so (there were financial penalties for exceeding whatever the limits were for each particular model) and would be returned to the likes of Hudson Kapel or Paragon who were meant to restore it to forecourt condition before ultimately disposing of it through the respective dealer networks.
If the car was bought by Hertz, then it had Hertz on the V5, would be kept for anything up to 30 months and 35-40k miles (you can imagine the state some of them were in by then,
) before going to one of 3 Hertz Sales Yards, where it would be prepared (usually by 3rd party contractors) for sale, sometimes to private individuals but usually 'in bulk' to car supermarkets and large multi-franchise multi-outlet organisations such as Arnold Clark.