if never undercoated or washed and waxed,about 5 yrs nowadays with the crap they build. my 1990 Olds looks like day we bought it, but our 2004 Ford is already rusted above wheel wells.
If they are an alloy, they will eventually rust.
How long will it t take a quarter to rust in fresh water
a long time
There is no rust remover that going to repair the rust that has accumulated on a car for that long. It will be best to have the floor repaired by a professional.
The best way to remove rust from a chrome with bodywork is to take your car to an autobody shop. They are the best people that can remove rust from chrome.
It depends on the quality of the nail. If it is painted it Amy take long to rust. In general it may take a month or so for the nail to rust.
a week it take or two
5 months
50 years
It depends on the state or area it is from. Some states use chemicals on there roads that increase corrison. The other thing is it would take a long time for the heavy metal parts to rust away due to the mass; like frame rails, suspension, and brake parts.
I don't think you are able to fix this rust problem, take you car to your local repair shop or car dealer. They should be able to take care of your problem and fix it for you. Hope I can help.
coke and a pipe cleaner