Silicic acid scum creates a grayish-white haze on the face of brick, which is referred to as _____ .
A) gray scum
B) white scum
C) efflorescence
D) smoke stains
Correct Answer:
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Q1: Most of the time, efflorescence cannot be
Q3: Use a cloth saturated with gasoline to
Q4: Fresh paint can be removed using a
Q5: _ stains are usually difficult to remove
Q6: Green-stained brick often show no sign of
Q7: Generally, _ refers to a white, powdery
Q8: A masking solution of _ can be
Q9: For particularly difficult stains, spike the cleaning
Q10: Permanent removal of manganese stains is simple.
Q11: Masonry cleaning products can be corrosive and
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