maintenance - less part need replacing because he no longer need to service* his car every one or two years (10,000 miles or 20,000 miles service depending on what car you have), at this rate it'll take him 10 years, maybe more to get it service (and part replaced).
a/c tank - no longer need replacing as he doesn't used it that much.
car wash - no need to wash regularly.
windscreen wiper fuel - again no need to buy bottle that regularly (okay £3 a bottle isn't much, but that's important beer money needed spending).
*most especially replacing the belt.
Not true, it still costs and parts wear out/degrade in different ways through non use.
Not true, it still costs and parts wear out/degrade in different ways through non use.