Scantron SelfScore Operator's Manual page 98

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3. Clean out any dust or debris that has collected in
the area between the top and bottom read heads
where it is hinged using canned air.
CAUTION: Do not use the canned air after this step
as it can blow dust on areas that have
been cleaned.
4. Lightly dampen a lint-free cloth with water or with
a static-reducing spray.
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