CMI Cleaning Techniques & Best Practices 4 — Questions and Answers
Question 1: What pH level characterizes a neutral cleaner?
- pH 1-3
- pH 4-6
- pH 7 (Correct answer)
- pH 9-12
Correct answer: pH 7
Neutral cleaners have a pH of 7, making them safe for daily use on most surfaces without the risk of damage from acidic or alkaline extremes.
Question 2: Which technique should be used when cleaning stairs in a multi-story building?
- Start at the bottom and work upward
- Start at the top and work downward (Correct answer)
- Clean alternate steps first, then remaining steps
- Clean the handrails last after all steps are done
Correct answer: Start at the top and work downward
Cleaning stairs from the top down ensures that debris dislodged from upper steps falls onto uncleaned steps below, preventing re-soiling.
Question 3: What is the function of a burnisher in hard floor care?
- To strip old finish from the floor
- To apply new coats of floor finish evenly
- To high-speed buff the floor surface to a high-gloss shine (Correct answer)
- To scrub embedded soil from textured tiles
Correct answer: To high-speed buff the floor surface to a high-gloss shine
A burnisher operates at high RPM to generate heat and friction that hardens and polishes the top layer of floor finish to a high-gloss shine.
Question 4: When using a backpack vacuum, what is the correct ergonomic practice to reduce injury risk?
- Lean forward when vacuuming to put more weight on the machine
- Adjust the harness so the weight sits on the hips, not the shoulders (Correct answer)
- Carry the vacuum by the hose when moving between rooms
- Fill the dust bag completely before replacing it to save time
Correct answer: Adjust the harness so the weight sits on the hips, not the shoulders
Properly fitted backpack vacuum harnesses transfer the weight load to the hips, which can bear more weight and reduce back and shoulder strain.
Question 5: What is the purpose of a pre-inspection before beginning a cleaning task?
- To calculate supply costs before ordering
- To identify hazards, special soil conditions, and set priorities before starting (Correct answer)
- To verify the client has signed off on the work order
- To measure square footage for billing purposes
Correct answer: To identify hazards, special soil conditions, and set priorities before starting
Pre-inspection allows the cleaning professional to identify hazards, unusual soiling, damaged areas, and high-priority zones before starting work.
Question 6: Which chemical should NEVER be mixed with bleach (sodium hypochlorite)?
- Plain water
- Ammonia-based cleaners (Correct answer)
- Neutral floor cleaner
- Enzymatic drain cleaner
Correct answer: Ammonia-based cleaners
Mixing bleach with ammonia produces chloramine gas, which is toxic and can cause serious respiratory injury.
Question 7: In the context of carpet maintenance, what does 'encapsulation cleaning' involve?
- Saturating the carpet with hot water and extracting soil
- Applying a polymer that surrounds soil particles so they dry into crystals and are vacuumed away (Correct answer)
- Sealing the carpet with a protective coating after cleaning
- Using dry compound powder that absorbs soil on contact
Correct answer: Applying a polymer that surrounds soil particles so they dry into crystals and are vacuumed away
Encapsulation uses a polymer solution that surrounds soil particles; as it dries, it crystallizes and the encapsulated soil is removed by vacuuming.
CMI Cleaning Techniques & Best Practices 4
What pH level characterizes a neutral cleaner?