This is recommended maintenance for the barcode scanner.

Test the barcode scanner after cleaning to ensure it is still properly aligned. 

Never spray anything onto the bar code scanner directly.

Step-by-step guide

The lens of the scanner should be cleaned with a non-abrasive cleaner such as rubbing alcohol.

It is suggested to lightly moisten a paper towel or lint-free cloth and wipe clean the eye of the bar code scanner.