Separate dirt from damage
A clear windshield starts with understanding what is affecting the view. A smear left by a blade, a deposit on the surface and a crack are different problems. Check the glass while parked rather than trying to investigate a mark while driving.
Check the glass, washers and blades together
Kansas Driving Handbook: vehicle checks identifies clear windows and functioning wipers and washers as important vehicle checks. Use the care instructions for your vehicle and any applied film or coating when choosing cleaning products. If the blades leave marks, check their condition and fit instead of assuming that stronger chemicals will solve the problem.
Ask for help when cleaning is not the answer
A mark that remains after permitted cleaning needs to be identified before further treatment. Tell a qualified provider what you have already tried, where the mark is and whether it affects your view. Do not use a chip-repair product for an unidentified scratch or coating problem.
Keep your attention on visibility before the next trip. If the view cannot be cleared adequately, arrange appropriate help rather than relying on a guess about the mark. A maintenance checklist is useful preparation, not a substitute for assessing damaged glass.
For more on looking after the glass, see our windshield maintenance checklist and guidance on wipers that leave marks. If you notice a chip, crack or persistent mark, review our windshield damage assessment guidance.