How to Deep Clean

Most offices get a routine clean that keeps them presentable. Deep cleaning is a different job. It is the reset that gets behind, under and above the day to day routine, the top of the cabinets, the vents, the grout, the carpet traffic lanes and the appliances nobody wants to look at.

The problem is that deep cleaning gets skipped, because routine cleaning already uses the available time. So grime builds up quietly until a space stops looking tired and starts looking neglected, and by then the work is heavier and more expensive than it needed to be.

Here is a practical approach to deep cleaning a commercial space, the order to work in, the tasks worth doing yourself and the ones worth calling a professional for. We are a locally rooted cleaning company that has handled deep cleans across the Seattle area since 2012, so this is how we actually do it.

What Deep Cleaning Means, and What It Is Not

Deep cleaning is not a longer version of your regular clean. It targets the build up that routine visits do not reach: grease behind appliances, dust in vents and on high surfaces, mineral film on glass, soil in carpet fibres and grout, and the areas under and behind furniture. A deep clean is also the right moment to reset things that get worn out by daily use, like floor finish.

It is worth being clear about the two jobs, because they are priced and scheduled differently. Routine janitorial services keep a space consistently clean. A professional commercial deep cleaning resets it, and most buildings need one several times a year rather than every week.

Before You Start: Declutter and Plan

You cannot deep clean around clutter. Boxes, stacks of paper and personal items slow every task and hide the surfaces you are meant to clean. Before a deep clean, clear desks and benches, remove personal items, and get rid of anything that no longer needs to be in the space. If you do nothing else to prepare, this alone will speed the job up.

Plan the order of work as a route, not a list. Move through the space once in a sensible sequence rather than jumping between rooms, and gather your equipment first so you are not walking back and forth. Deep cleaning burns time on movement, not just on cleaning.

Work Top to Bottom, Dust to Damp

This is the rule that keeps a deep clean from becoming a mess. Dust and debris fall. If you clean floors first and ceilings last, you undo your own work. Work from the highest point down, and from dry tasks to wet tasks, so you are not spreading mud around a surface you have just washed.

• High dusting first. Ceiling corners, vents, light fittings, the tops of cabinets and partitions, and anything else above eye level.
• Dry dusting next. Walls, ledges, sills, blinds and the tops of door frames.
• Then damp wipe. Furniture, desks, rails and hard surfaces.
• Glass and mirrors after dusting, never before.
• Floors last, always, once nothing else will drop onto them.

Following that order is most of the difference between a professional deep clean and a frustrated weekend effort. It is also why high dusting is treated as its own scheduled task in a good contract rather than an afterthought.

Room by Room

Ceilings, vents and high surfaces

Vacuum or dry wipe vents and diffusers so dust is removed rather than pushed around. Clean ceiling corners and the tops of units and partitions. This matters beyond appearance, because dust that settles back into the room is what people breathe.

Walls, glass and partition screens

Spot clean walls and light switches, wipe partition glass and door glass, and clean interior windows. Exterior glass is usually a separate job, so a commercial window cleaning visit is the better way to handle the outside of the building at the same time.

Kitchen and break room

Deep cleaning a kitchen means pulling appliances out where you safely can, cleaning behind and under them, degreasing the splashback and extraction points, cleaning inside the microwave and fridge, descaling the kettle and sink, and treating the bin area. Commercial kitchens also need their extraction systems attended to, which is a specialist job covered by kitchen hood cleaning.

Restrooms

Descale taps, shower heads and fittings, clean grout and the base of fixtures, disinfect all touch points, clean vents and mirrors, and remove limescale from glass and metal. Restroom grout and tile are where a deep clean makes the most visible difference, and tile and grout cleaning is often the fastest way to reset a tired looking bathroom.

Floors

Vacuum thoroughly, including edges and under furniture where reach allows, then machine clean what needs it. Carpet in traffic lanes needs extraction, which is carpet cleaning rather than a heavy vacuum. Hard floors need mopping and, on vinyl, stripping and rewaxing to remove built up finish and restore a clean surface, all part of a proper floor care routine. Detail the edges and corners that a mop skips.

The Tasks Worth Calling a Professional For

Some deep cleaning tasks are best left to a trained crew with the right equipment. Carpet extraction, floor stripping and waxing, high dusting at height, window cleaning above ground level, tile and grout restoration and kitchen extraction cleaning all need machinery, access equipment and knowledge of the surfaces involved. Attempting them with the wrong products can damage floors and coatings in ways that cost more to fix than the original clean.

That is not a reason to avoid doing the rest yourself. A lot of the routine deep cleaning work, such as decluttering, dusting, appliance cleaning and general wiping, can be handled in house between professional visits. The two work well together, and our guide to communal areas covers the shared spaces where an in house effort pays off fastest.

A Practical Deep Cleaning Checklist

• Declutter and clear surfaces before you begin.
• Vacuum vents and high surfaces, then dust from the top down.
• Wipe walls, switches, sills and partition glass.
• Clean interior windows and mirrors.
• Deep clean kitchen appliances, splashbacks and bins.
• Descale and disinfect restrooms, including grout and fittings.
• Vacuum carpets including edges, and machine clean where needed.
• Mop and, where applicable, strip and reseal hard floors.
• Replace filters, liners and worn items, and note anything broken for repair.

A finished deep clean is also a survey. Note the damage, the worn floor finish and the slow leaks while everything is visible, so you can plan the next round of work before it becomes urgent.

How Often Should You Deep Clean?

For most offices, a deep clean once or twice a year keeps the space genuinely clean rather than merely tidy, with a heavier pass before the busy season or before a client facing event. Buildings with heavy traffic, kitchens or public restrooms should sit at the shorter end. Good scheduling keeps deep cleaning manageable, because the heavier the build up, the more hours it takes to remove. If you are unsure how deep cleaning should fit alongside routine service, our breakdown of cleaning frequency explains how to tier the work by area.

Deep Cleaning in Seattle

Buildings around here have their own quirks. Long grey winters mean more tracked in grit and more moisture around entries, which wears floors faster. Damp air and closed windows over the cooler months let dust settle indoors, and older Pioneer Square and First Hill buildings often have vents and high surfaces that have not been touched in years. We handle deep cleans for offices, clinics and mixed use buildings across Seattle area and have done since 2012. If you would rather hand the heavy work to a crew that does it every week, request a free quote and we will walk the space with you.

Frequently Asked Questions