The groove where the wear indicator is located is 1/16 inch (1.6 mm) shallower than elsewhere on the tire. If the tread has worn so that the indicator is exposed, replace the tire.
Worn out tires have poor traction on wet roads.
Honda Civic Owners Manual. Maintaining the Bumpers and Other Resin Coated Parts
If you get gasoline, oil, engine coolant, or battery fluid on resin coated
parts, they
may be stained or the coating may peel. Promptly wipe it away using a soft cloth
and
clean water.
Maintaining the Bumpers and Other Resin Coated
Parts
Ask a dealer about the correct coatin ...