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Recommended Cleaning Intervals for Fabrics

In order of frequency

Environment	Normal	Special Conditions	Cleaning
Nursing Home	6 months	High Humidity	1 month
Daycare	6 months	High Humidity	3 months
Restaurant	6 months	Dusty outside High Humidity	4 months 3 months
Office building	1 year	Ground level	6 months
Commercial	1 year	Dusty outside High Humidity	6 months 6 months
School	1 year	Dusty outside	6 months
Family Residence	3 years	Children & pets Smoking	1 year 6 months

Recommended Cleaning Frequency for Carpets

In order of frequency

Environment	Normal	Contaminated Outside Dusty	Extremely Cold Weather Climates	High Humidity Biogenic
Daycare	2 weeks	1 week	2 weeks	1 week
Nursing home	1 month	1 month	1 month	1 week
Residence: (2 persons, non-smoking)	6-12 months	2 months	4-6 months	4-6 months
(2 persons, smoking)	4 months	2 months	3 months	4 months
(Young children)	6 months	1 month	3 months	3 months
(Young children w/pets)	3-6 months	1 month	2 months	2 months
Office Building: (ground floor)	3-6 months	1-4 months	2-6 months	2-6 months
(Higher floors)	6-12 months	2-6 months	3-9 months	3-9 months
Food Service Establishment	1 months	1 week	2 weeks	2 weeks
Commercial (retail shop, banks)	3-6 months	1 month	2 months	2 months

From USEPA letter, January 1989

Cleaning Methods Summary

Spray Extraction: The spray extraction or steam cleaning methlod injects the pile with a hot cleaning solution under pressure. A large percentage of the solution is then immediately extracted along with dirt and grime.

Rotary Shampoo: In the rotary shampoo system, detergent is fed through a rotating brush about 16 inches in diameter. The detergent solution loosens embedded dirt and suspends it high in the pile. A wet pick up vacuum should be used immediately to remove the suspended soil before it is redeposited.

Bonnet Cleaning: In bonnet cleaning, a pad is driven by a rotary machine. The pad may consist of nylon or a mixture of other synthetic and natural yarns. This method is used to supplement the ahnve two meth ods rather than replace them.

Inplant Cleaning: In inplant cleaning, the detergent solution is sprayed under pressure on the carpet, which is facing up and is moving laterally. The wet carpet is agitated by brushes; then it goes through the rinse cycle, ringer and then is dried.