A
So plan 2 is a reduction/ protection/decontamination protocol. Reduce contact (don't leave the house unless really important). Wear an N95 mask in public. Carry the fewest things in public (leave the wallet, just take the credit card). Use the trunk as a dirty zone (leave all items you or others have touched there). Spray anything you remove (keys, credit card, phone). Driver's area should then remain uncontaminated. At home, use a specific "dirty area" to set items being brought into the house. Spray and wait for contact time, and remove each item. Wash your hands. Presume that your clothes or other body surfaces don't have enough virus to worry about.
This might sound extreme, but I think could become routine. If we learn more about transmission, it could be relaxed, but based on the Diamond Princess transmission rate during quarantine, even the above steps seem less than guaranteed to prevent transmission.