A double broiler is only meant for very specialized dishes. I would not recommend it for every household.
Ordinary soap that is not powder is an example of a household product that one can use to clean a car
Yes to both categories.
lye or bleach
its cleaning product
Salt
Hazardous Household Product Symbols.
A sponge
The three major household laundry product categories were electric washing machines, electric dryers, and gas dryers
DHMO, dihydrogen monoxide
One can purchase gourmet popcorn at many retail locations, both in person and online. Examples of such locations that offer the product include Walmart or online at the Amazon website.
Probably vinegar.
Product market