You’ll have to do a lot of cleaning and move out for a couple of days.
The solution is to encapsulate the crawl space and prevent condensation.
The system is probably too big for the house; dehumidifiers can help.
Parts are available for these sturdy appliances, which were built to last.
A custom-plating company can do it, but it’s expensive. Or you can buy new hardware, if it fits.
The room was flooded, the floor repaired, but were the new boards laid correctly?
A hardwood floor cleaner, or mild detergent and water, should do the job.
Lots of options available for kitchen chairs: If one doesn’t work, try another.
Plastic lumber doesn’t have the strength of real wood, and needs support.