I agree w/previous poster that six-wks is short. And either trickle or remove the battery if you don't have electrical access and - assuming mechanical key will lock doors...
One other thing, I might pump up the air in the tires to maximum tire psi listed on sidewall.
Full gas tank ?
Wash and wax paint and wheels ?
Some people have rodents in garages so something like moth-balls to deter.
If there are moisture or mildew deterrents for the interior, may give them a try.
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