If streaks appear in all your scanned images, try
these solutions:
Clean the glass surfaces inside your scanner using a genuine
Epson cleaning kit or the microfiber cloth that may have come with
your scanner.
The Epson ScanSmart software can alert you when dirt is
detected on the scanner glass. Select Settings > Scanner
Settings > Device Settings
> Scanner Setting, select a
setting for Detect Glass Dirt, and
click Set.
Note: Not all
lines or dirt can be detected. Dirt may not be detected depending
on its position, shape, and concentration. Select a higher or lower
Detect Glass Dirt setting as
necessary.
Keep the scanner cover closed when it is not in use to prevent
dirt or dust from getting inside.