Rocks and other flying debris that hit a windshield will make pits or small concave holes in the glass. Repeatedly parking a car under some types of trees enables saps to drip on windshields and form pits over time. Using automobile glass pit polish and a sander fills the holes to the surface level and smooths them for a seamless repair job.
Turn a garden hose on and spray the windshield to rinse any loose debris off the surface.
Squirt car wash soap into a bucket and add water from the garden hose to make a soapy mix.
Dip a car wash sponge into the mix and thoroughly clean the windshield. Spray the car wash off with the garden hose.
Let the windshield dry.
Place a glass-sanding disc on an orbital sander. Press the disc onto the sander so the Velcro adheres to the sander guard.
Squirt auto glass pit polish onto the centre of the sanding disc.
Turn the sander on and place it on the pits in the windshield. Move the sander in a circular motion over the glass pits. The polish will fill the pits so they are not noticeable.
Turn the sander off and feel the pits with a fingertip. Continue using the sander until the surface where the pits were is completely filled with pit polish and level with the rest of the windshield.
If pits are very deep, the windshield will require additional pit polish in that area. Do not use polishing discs for paint or car bodies on a windshield. Use only a glass disc with very fine fibres for car windshields.
Pits in windshields reduce visibility in nighttime driving situations. Oncoming headlights form a dangerous glare in the pits and obstruct a driver's vision.