Clean glass surfaces — Delaware Permit Test

Clean glass surfaces on the Delaware permit test — 4 rules, each with the reason behind it and a question on it while it is fresh.

The rules

Clear snow, ice or frost from all windows before driving, front, sides and back.

Driving with only a small hole scraped in the windshield hides the car coming from the side.

Clear snow, ice, or frost from all windows before driving.

Delaware Driver Manual, p.107

Do not hang things from your mirror or clutter the windshield with decals; they could block your view.

An air freshener swinging from the mirror can hide a person stepping off the curb.

Do not hang things from your mirror or clutter up the windshield with decals.

Delaware Driver Manual, p.108

Keep your headlights, backup, brake and taillights clean; dirt on the lenses can reduce the light by 50%.

A muddy taillight at night makes your car look much farther away than it is.

Dirt on the lenses can reduce the light by 50%.

Delaware Driver Manual, p.108

Keep your window washer bottle full, and use antifreeze wash where the temperature could fall below freezing.

Plain water in the washer freezes on the glass and turns a dirty windshield into an icy one.

Use antifreeze wash in areas where the temperature could fall below freezing.

Delaware Driver Manual, p.107

On the test

Before driving on a frosty morning, which windows should you clear?

All windows, front, sides and back. Driving with only a small hole scraped in the windshield hides the car coming from the side. Delaware Driver Manual, p.107: “Clear snow, ice, or frost from all windows before driving.”

How this works

Most practice tests hand you a bank of questions and leave the manual somewhere else. This one puts them together.

You read one law and the reason behind it, then answer a question on that law while it is still fresh. Get it right and you move on; get it wrong and you have found the gap while it is cheap to fix, not on the morning of the exam.

Learning one rule at a time, and proving it immediately, is what turns a manual you skimmed into something you actually know — and it makes studying feel like getting somewhere rather than like waiting to find out.

What it costs

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  • Paying opens the rest of the cards, unlimited full-length practice tests, and retests built from exactly the questions you got wrong.
  • Every level up to Prepared — 3 tests passed in a row.
  • Do the work, fail the real exam, and we refund you.

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Where these come from

Every rule here is checked against Delaware Driver Manual, published by the Delaware Division of Motor Vehicles, and against the state code itself. Last checked 2026-10-05.