Annoying things my other driver does;
No concept of what climate control is - Too hot, turn temp to minimum switch air con on and fan to fastest setting. When it starts to get cold dont turn temp up, instead turn the fan speed OFF, when it warms up put it back on FULL.
Likewise when its cold, turn temp to highest setting then adjust temperature in cabin by fan speed- too cold full speed, too hot off.
TICK
Radio volume - full blast. I can hear him coming halfway down the street, inside my house above the TV ! Worse, when I start the car because it's a hybrid the engine doesnt start straight away so I go from complete silence to full blast radio straight away.
TICK and it's always been changed from DAB to analogue

after the driver asked especially if we could get a vehicle with DAB
Fingerprints on windscreen - All over it. I can understand round where the PDA is mounted, but in the middle, top right corner, bottom right corner (he'd have to lean all the way forward to reach there, can't be done sitting normally in the drivers seat). Every night I clean them off and the next day they're back.
Crumbs, drink spillages - He must go into Greggs and ask for the flakiest roll they do, crumbs in the footwell, drivers seat, centre console, there's more mess after one day than passengers make in the rear in a whole week. And coffee marks, if it's not a ring on the dashboard it's a spot somewhere on the steering wheel or centre console. Again I clean every night and the next day there's a new one somewhere.
AND FAG ASH !!!!!!!!!
Rubbish in the boot - Nearly every day I open the boot and the remains of his foraging are there, empty sandwich wrappers, drinks cups, half-eaten kebabs etc. Thats not if he's just left his empty drink in the cup holder.
glove compartment usually
Messing with car settings - can go for weeks without touching anything, then one day I'll get in and the rear-view mirrors been moved, wing mirrors adjusted, headlamp level changed, info and dashboard settings changed. Not every day but once a month for no reason.
Using all my screenwash - Have to put nearly a litre in every week, I hardly use it - a quick squirt and wipe and alls good. He must sit there with the washers going non-stop for thirty seconds a time !
Not wiping windscreen properly - After the above, users the wipers briefly then lets dribbles run down the screen and dry out without wiping them off.
Using company cards for notes - I'll go to give a customer one of our cards and find that theres been a phone number or someones name or 'pick up milk' written on it, not just the one but half a dozen. Writes on them and then just puts them back with all the other cards.