I'd have to go through the house. I'll do it but I'm gonna tell him to have the front and back doors open beforehand.
Gonna treat this like a game of "the floor is lava" except everything is lava.
Honestly - I'm not a doctor but there are simple precautions you can take. You don't have to be excessively worried.
Wear disposable gloves - fresh ones of course so you aren't leaving anything on door handles, surfaces etc. Do you have alcohol based wipes or at least wet tissues? I'm in Tokyo and there are plenty of sanitation products that are cheap if you can't afford or can't buy the more expensive ones because they're sold out.
If you can't get them wherever you are, take a clean cloth and some cleaner - bathroom cleaner, even a strong washing up liquid will do it. Clean any surfaces you touch if you can't avoid then use another clean cloth to dry the wetness. A clean scarf around your mouth and lower part of the nose will be enough to stop them breathing in any of your droplets. And wear a hat.
I think the authorities are becoming over-bearing. I went to see cherry blossom trees by myself yesterday in Tokyo and people, especially families, were not having the usual parties at those kind of locations but they were walking around looking and taking photographs. In fresh air and sunshine - two of the best natural antidotes to viruses especially the Vitamin D from the sun.
Authorities should worry about crowded shopping areas of which there are too many in Japan and employers should be staggering their workers' starting hours. Some are doing it but the subways and trains are still too packed. I have taken to walking to a big station that before I went to by my local subway line. The big station is only 5 minutes from the station I get off for my work. At night I do the same and walk home 30 minutes instead of riding my local subway line. Too many Tokyoites are still packing the trains until 10.30pm or so from early evening.
THAT'S the problem - not people walking around in fresh air and sunlight.