CMI Cheat Sheet 2026

The 30 highest-yield CMI facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. In the context of green cleaning programs, what does 'dwell time' refer to? → The time a cleaning chemical must remain on a surface to be effective
2. What is the correct dilution principle when preparing disinfectant solutions for restroom cleaning? → Follow the manufacturer's label instructions precisely
3. Which type of mop system is considered more sustainable because it reduces water and chemical usage? → Flat microfiber mop system
4. When stripping old floor finish from VCT, what neutralizing step is required BEFORE applying new finish? → Rinse the floor thoroughly with clean water to neutralize stripper residue
5. What is the role of regulatory compliance in sustainability? → Follow environmental laws
6. When cleaning restroom floors near urinals and toilets, which technique reduces exposure to aerosolized pathogens? → Wet mop with disinfectant using gentle, low-agitation strokes
7. What is the recommended procedure for cleaning a microwave in a break room? → Place a bowl of water inside and run for 2 minutes to loosen debris, then wipe clean
8. Which OSHA standard specifically covers the safe use of ladders in the workplace? → 29 CFR 1910.23
9. A custodian finds that a disinfectant cleaner's solution has been sitting in a bucket for 6 hours. What should be done? → Discard the solution and prepare a fresh batch
10. When working in occupied areas, a custodial technician should primarily: → Minimize disruption to occupants while maintaining cleaning standards
11. A custodial technician observes a coworker skipping required cleaning steps to finish earlier. What is the most professional response? → Report the behavior to a supervisor following proper protocols
12. A facility is implementing a sustainability initiative and asks custodians to track chemical usage. What is the primary purpose of this tracking? → To identify overuse, reduce waste, and demonstrate progress toward sustainability goals
13. When a CMI professional encounters unexpected results during a procedure, the FIRST action should be: → Stop, assess, and determine whether to proceed or seek guidance
14. How should custodial staff dispose of cleaning product containers that are completely empty? → Triple-rinse if required, and recycle or dispose of per manufacturer and local regulations
15. What is the CORRECT sequence when performing a Certified Custodial Technician technical procedure? → Plan, prepare, execute, verify, and document
16. When a building occupant complains that a restroom was not cleaned properly, what is the most appropriate first response from a custodial technician? → Apologize and immediately return to re-clean the area
17. A school custodian is selecting a floor stripper. Which ingredient should they avoid to minimize environmental harm? → High levels of volatile organic compounds (VOCs)
18. How should Certified Custodial Technician professionals handle updated procedures? → Review updates, complete training, implement revisions
19. Which mopping technique minimizes re-soiling of clean areas in a large hallway? → Figure-8 pattern walking backward away from clean area
20. Why is energy efficiency important in facilities? → Reduce costs and impact
21. What role does calibration play in Certified Custodial Technician technical accuracy? → Ensures instruments produce accurate results over time
22. What role does calibration play in Certified Custodial Technician technical accuracy? → Ensures instruments produce accurate results over time
23. When cleaning restrooms, what is the correct order of operations to prevent cross-contamination? → Clean high surfaces first, then fixtures, then floors
24. Why is proper ventilation important during restroom disinfection? → To prevent inhalation of chemical vapors and ensure safe air quality for workers
25. When preparing to clean a private office, a custodial technician should: → Knock and announce their presence before entering, even if the office appears empty
26. Which type of waste requires a red bag for disposal in commercial and healthcare facilities? → Regulated medical or biohazardous waste
27. Which energy-saving practice in custodial operations reduces electricity use without compromising cleaning effectiveness? → Scheduling high-energy equipment use during off-peak hours
28. Which government agency administers the Design for the Environment (DfE) program that helps custodians identify safer cleaning products? → U.S. Environmental Protection Agency (EPA)
29. What is the best way to prevent slips and falls? → Maintain clean and dry floors
30. When a CMI professional encounters unexpected results during a procedure, the FIRST action should be: → Stop, assess, and determine whether to proceed or seek guidance