We'll Do Your Dirty Work
We'll Do Your Dirty Work
Casey’s Cleaning delivers thorough commercial deep cleaning services to businesses across Suffolk County and Nassau County. When regular maintenance cleaning isn’t enough — after a renovation, before a major inspection, following a long vacancy, or at the end of a busy season — our deep cleaning crews go floor to ceiling, surface to surface, and corner to corner. We restore your facility to a standard that everyday cleaning simply can’t reach.
Years Serving LI
Commercial Clients
Satisfaction Guaranteed
Custom plan. No obligation. Response within 24 hours.
Bonded & Insured
EPA-Approved Products
Background-Checked Staff
Flexible Scheduling
5-Star Google Rating
Dedicated Cleaning Partners
From small professional offices to large industrial facilities — our deep cleaning crews have restored every type of commercial environment across Nassau and Suffolk County. If it’s been neglected, renovated, vacated, or just needs a serious reset, we’re the team to call.
Over time, offices accumulate grime in places routine cleaning never reaches — behind furniture, inside vents, along baseboards, under desks, and inside break room appliances. Our deep cleaning teams work through every layer of your office top to bottom, restoring a level of cleanliness your staff will notice immediately.
Healthcare environments demand deep cleaning that goes well beyond surface wiping. We follow strict sanitation protocols for exam rooms, surgical prep areas, waiting rooms, and restrooms — eliminating bacteria, biofilm, and contaminants that build up over months of regular use. Ideal before inspections or after high-volume periods.
Grease, food buildup, and bacteria accumulate fast in commercial kitchens. Our deep cleaning service covers exhaust hoods, fryer surrounds, behind equipment, floor drains, tile grout, and every surface health inspectors check. We help Suffolk and Nassau County food service businesses pass inspections and maintain safe operating environments.
End-of-season or post-renovation deep cleans give retail spaces a fresh start. We clean display fixtures, fitting rooms, stockrooms, restrooms, and all floor surfaces — removing months of accumulated dust, scuffs, and grime so your store looks like it just opened.
Taking over a vacated commercial space or finishing a renovation in Nassau or Suffolk County? Post-construction and move-in deep cleans remove construction dust, adhesive residue, paint overspray, debris, and all traces of the previous occupant — so the space is truly move-in ready for your business or tenants.
End-of-year school deep cleans, gym equipment sanitization, and seasonal resets for high-traffic facilities require a crew that understands scale and thoroughness. We deep clean locker rooms, gymnasiums, classrooms, cafeterias, and all shared spaces to a standard that protects the health of everyone who uses them.
Deep cleaning is a bigger job — we make the process straightforward from the first conversation to the final walkthrough.
We visit your facility at no charge to assess the scope of work — identifying areas of heavy buildup, surfaces requiring special treatment, and anything that needs equipment beyond standard cleaning supplies. No assumptions, no surprises.
Based on our walkthrough, we build a detailed scope of work specific to your facility. You'll know exactly what areas are being cleaned, what methods and products we're using, and how long the job will take before we start anything.
Our crews work systematically from ceiling to floor — vents, light fixtures, walls, windows, furniture, equipment, baseboards, and floors. Nothing is skipped, nothing is rushed. We use commercial-grade equipment and EPA-registered products suited to your facility type.
When the job is complete, we walk the entire facility with you — area by area. If anything doesn't meet the standard we set at the start, we address it before we pack up. You sign off on the work, not us.
After a deep clean, we give you honest recommendations for ongoing maintenance cleaning frequency to keep your facility from needing another deep clean sooner than necessary. Many clients follow up with our regular janitorial service to protect the results long-term.
A deep clean is only worth the investment if it's done thoroughly and methodically. Every facility in Suffolk and Nassau County is different — different surfaces, different buildup, different standards. We assess before we quote and execute before we leave.
Full facility assessment before every job
Systematic top-to-bottom cleaning process
Commercial-grade equipment and products
Detailed scope of work provided upfront
Final walkthrough and sign-off with client
Fully bonded, and insured
Your specific scope is confirmed during your facility walkthrough. Below is a general overview of what commercial deep cleaning covers across most facility types in Suffolk and Nassau County.
Cleaning and sanitizing all wall surfaces and baseboards
Dusting and wiping ceiling vents, grilles, and light fixtures
Cleaning interior windows, sills, and glass partitions
Scrubbing door frames, handles, and switch plates
Removing grease, grime, and buildup from all vertical surfaces
Cleaning behind and underneath furniture and equipment
Scrubbing and disinfecting all toilets, urinals, and sinks
Descaling faucets, showerheads, and tile surfaces
Cleaning inside and behind toilet bases and tank exteriors
Scrubbing tile grout lines with commercial-grade solution
Disinfecting all dispensers, handles, and high-touch surfaces
Mopping floors with heavy-duty disinfectant and deodorizer
Degreasing and cleaning inside and outside all appliances
Scrubbing sinks, faucets, and drain areas
Cleaning inside cabinets, drawers, and shelving
Sanitizing countertops, tables, and chair surfaces
Deep cleaning floors including edges and corners
Removing buildup from grout, tile, and flooring seams
Disinfecting all shared surfaces and high-touch points
A deep clean is a significant investment. You need a crew that shows up fully prepared, executes the scope completely, and doesn't cut corners when no one's watching. Casey's has built its reputation across Nassau and Suffolk County on exactly that — thorough work, professional conduct, and results you can see and feel.
Deep cleaning jobs often need to happen outside of business hours — over a weekend, during a holiday closure, or overnight before a big opening. We accommodate your timeline without asking your business to pause. We work around you, not the other way around.
Deep cleaning involves stronger solutions and more intensive methods — but that doesn't mean unsafe ones. We use EPA-registered, commercially approved products that are effective against heavy buildup, bacteria, and contaminants while remaining safe for re-occupancy after the job is complete.
We walk your facility, write a detailed scope of work, and give you a firm quote before a single crew member enters your building. No vague estimates, no surprise add-ons mid-job, no billing for work we didn't discuss. What we quote is what you pay.
Everything you need to know about commercial deep cleaning services in Suffolk and Nassau County.
Cost depends on facility size, the scope of work, and the current condition of the space. Most commercial deep cleans range from $400 to $1,500+ depending on square footage and complexity. We provide a firm, itemized quote after a free walkthrough — never a blind estimate over the phone.
Regular janitorial service maintains cleanliness on an ongoing basis — it keeps a clean space clean. Deep cleaning addresses the buildup that accumulates over months or years that routine cleaning doesn't reach — behind equipment, inside vents, grout lines, baseboards, appliance interiors, and surfaces that are typically overlooked in day-to-day maintenance.
It depends on the size and condition of your facility. A single office suite may take 4–6 hours. A large multi-room facility or commercial kitchen could take a full day or multiple days. We give you a time estimate as part of your written scope of work before we begin.
For most commercial deep cleans, yes — it's most efficient and effective when the space is unoccupied. We schedule accordingly, typically on weekends, after hours, or during planned closures, so your operations aren't disrupted.
Yes. Every crew member is background-screened before joining Casey's and is covered under our full general liability and workers' compensation insurance. We're bonded as well, giving you additional peace of mind when our crews are working in your facility unattended.
We serve businesses specifically in Suffolk County and Nassau County — including Hauppauge, Melville, Commack, Smithtown, Ronkonkoma, Islip, Bay Shore, Babylon, Brentwood, Hicksville, Hempstead, Garden City, Mineola, Uniondale, Westbury, and surrounding Long Island communities.
Get a free, no-obligation facility walkthrough and deep cleaning quote — response within 24 hours. No pressure, no guesswork. Just a thorough clean done right.
Welcome to Casey’s Cleaning, your trusted partner in professional cleaning services. We are dedicated to providing top-quality cleaning solutions for homes, offices, rental properties, and commercial spaces.
Welcome to Casey’s Cleaning, your trusted partner in professional cleaning services. We are dedicated to providing top-quality cleaning solutions for homes, offices, rental properties, and commercial spaces.