Short answer
Standing water you can't see is the real danger. Left under the carpet and on the floor pan, it quietly rusts out the metal, corrodes wiring and seat mounts, and turns a simple leak into expensive structural and electrical damage.
Where the water hides
The puddle you mop up is the part you can see. Underneath the carpet sits dense padding that holds water against the floor pan for days — exactly the conditions that start rust.
What it damages over time
- The floor pan — surface rust that becomes holes
- Wiring, connectors & modules — many live under the seats and carpet
- Seat-mount and seatbelt hardware — corrosion is a safety issue
Why you don't notice until it's bad
It's out of sight and slow. By the time there's a smell, a soft spot, or an electrical gremlin, the corrosion is already underway.
Stop it before it costs you
Dry it out, then close the entry point with the missing body-side weatherstripping so it can't happen again.