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24 companies listed · 7 in Ontario · 3 open 24/7 · 16 open weekends · 20 rated 4.5+
Data verified October 15, 2026
Listed for businesses in and around Ontario, CA, these 24 companies hold commercial cleaning contracts. Contract cleaning is priced off a written scope and a frequency schedule, so two quotes are only comparable when both are working from the same specification.
7 of the 24 companies we list are based in Ontario; the other 17 serve Ontario from towns including Riverside (14 mi), Rancho Cucamonga (6 mi) and Corona (13 mi). 23 of the companies on this page have a rating, from 4.1 to 5.0 across 1,004 reviews; 6 have 50 or more reviews and 20 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (90%), quality (88%) and responsiveness (87%). The topics that come up most in reviews of the companies on this page are "price" and "communication". 3 are open around the clock; 16 are open on Saturdays and 12 on Sundays. The services the companies on this page list most often on their websites are carpet cleaning (2), commercial cleaning (2), floor care (2), pressure washing (2) and window cleaning (2). 2 show a license on their websites and 6 have a BBB rating of A or A+. 16 have ten or more years of experience, the longest 43 years. 3 offer emergency call-outs; 9 give free estimates; 4 are family- or locally-owned and 5 list coupons or special offers. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book.
An address in Ontario is given by 7 of the 24 commercial cleaning companies here; the others come from other towns within 20 mi. For nightly work, the supervisor's drive matters more than the office address, since a site that is an hour from the nearest manager gets inspected less often.
