40Notes:So me cleaning methods can damage your meter. To protect it, DO NOT:• U se vinegar or scouring agents to clean the meter because they can harm the displayand measurement window.• Spray any cleaning solution directly onto the meter.• Put the meter under water (or any liquid ) .• Pour liquid into the meter.Caring for your ACCU -CHEK Active meter is easy. If the display or the outside of the meter isdirty, wipe it off with a slightly damp cloth. Only use water to dampen the cloth.If there is any blood in the test strip opening or if your meter displays the E-4 or E-5message, follow these steps to clean it:1. Take the strip guide off by pressing down with your thumb as you slide it off.2. Clean the guide with a soft cloth dampened slightly with cleaning solution (dishwashingdetergent and water or 1:10 bleach solution)* or by letting it soak for one hour in the solution.3. Gently wipe the measuring window with a dry lint-free cloth.4. When the guide is dry, gently slide it back onto the front of the meter until it clicks into place.Do not operate the meter without the test strip guide attached.5. Run a control test (see Chapter 2, “ Running a Control Test” ) to make sure the meter isworking properly.Chapter 5: Maintenance and TroubleshootingCleaning Your Meter*Blood disinfection is only achieved using 10% bleach solution made fresh the day of use.