How to Clean an Outdoor Rug

Written & researched by Derek Holt Home & Appliances Editor

Updated October 2026

Sweep the loose debris off, hose both sides, scrub with a soft brush and dish soap, rinse until the water runs clear, and dry it standing up. Total time is about 30 minutes plus drying, and it needs doing two or three times a season. The two steps people skip are the ones that matter: removing grit before scrubbing (otherwise you grind it in), and drying the rug upright rather than flat, which cuts drying time by hours and stops the surface underneath staying wet.

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First, know what your rug is made of

Almost all outdoor rugs sold in the US are polypropylene, which is forgiving — it does not absorb water into the fiber, it tolerates soap and mild acids, and it can go in the sun. A few are polyester or recycled PET, which behave similarly. The ones that need care are natural fibers, and the short version is that they should not be outside at all.

If you are not sure which you have, hold a corner under a tap. Water beading and running off means a plastic tape weave. Water darkening the surface and sitting in it means a pile rug that will need real drying time.

The full clean, step by step

1. Move the rug off the surface first. Drag it onto grass or a driveway. Cleaning a rug in place soaks the deck or slab underneath, which is exactly the condition you are trying to avoid.
2. Get the dry debris off. Shake it, sweep it with a stiff broom, or vacuum both sides. Pine needles, pollen, sand and leaf fragments have to come out before water is involved — wet grit is abrasive and works deeper into the weave when you brush it.
3. Hose both sides. Start with the back. Grit sits in the underside of the weave, and rinsing from the back pushes it out rather than driving it through.
4. Mix the cleaner. A few drops of dish soap in a bucket of warm water handles most of it. For mold, mildew or a musty odor, use one part white vinegar to two parts water, or an oxygen bleach (sodium percarbonate) solution mixed per the label. Do not use chlorine bleach on a colored rug.
5. Scrub with a soft brush along the weave. Work in sections, let the solution sit five to ten minutes on stained areas, and resist a wire brush — it fuzzes polypropylene permanently.
6. Rinse until the water runs clear. Soap left in the fibers attracts dirt and gets slippery when wet, and it is the reason a freshly cleaned rug sometimes looks dirty again within a week.
7. Dry standing up, in sun if you have it. Over a railing, a fence, two chairs, or a sawhorse. Air on both faces is what dries it; a rug lying flat can take a full day and the underside may never get there.
8. Sweep the surface underneath before the rug goes back. This is the step that protects the deck, and it takes two minutes.

If your rug is one of the machine-washable types, that is easier still: cold water, gentle cycle, mild detergent, and air dry. A hot wash or a hot dryer will distort the backing and it does not come back.

Using a pressure washer without wrecking the rug

On a flat plastic-straw rug a pressure washer is genuinely the fast way to do this, and the difference between cleaning it and destroying it is entirely the nozzle.

• Pressure: 1200 PSI or less. If the machine has no regulator, stand further back.
• Nozzle: 40 degrees. A white or green wide tip. Never the red 0-degree tip — it will slice the tape weave and fur a pile rug in one pass.
• Distance: 12 to 18 inches. Closer than that concentrates the energy no matter which tip is fitted.
• Direction: along the weave, in overlapping passes, at a slight angle rather than straight down.
• Anchor the corners. A lightweight rug will fold over itself as soon as the spray catches an edge.

Full nozzle and pressure guidance by surface is in our pressure washer guide, which covers why the PSI figure on the box is the least useful number on it.

Mold, mildew and the musty odor

This is the reason most people search for this topic, and it is worth being straight about what is happening. That black or gray speckling and the smell that comes with it are microbial growth, and it needs three things: moisture, warmth, and organic material to feed on. An outdoor rug supplies the last two easily — pollen, leaf litter, food crumbs and skin cells all collect in the weave — so the only variable you control is moisture.

To deal with growth that is already there:

1. Dry the rug completely first. Full sun, both sides, until it is bone dry. Brushing wet growth smears it deeper; brushing dry growth removes it.
2. Brush the dried growth off outdoors, away from open windows and downwind of you. It is worth wearing a dust mask for this if there is a lot of it.
3. Scrub with vinegar solution or oxygen bleach. One part white vinegar to two parts water is enough for most synthetic rugs; oxygen bleach is stronger and safe on most colors, though it is worth testing a corner. Give it ten minutes of contact time.
4. Rinse thoroughly and dry in sun. Sunlight helps here beyond just drying — UV is genuinely hostile to surface growth.
5. Deal with residual odor. Baking soda sprinkled over the dry rug, left three or four hours, then swept and vacuumed off, absorbs a lot of what is left.

Now the honest part. If the growth got into the backing of a woven rug over a whole damp winter, cleaning the surface often will not fix the smell — it comes back within a day of the rug getting wet again, because the colony is inside the structure where your brush never reached. At that point the rug is finished. Replacing a $40 straw rug is the rational call; if it is a moldy rubber-backed rug, replace it with one that drains and the problem will not recur. Our outdoor rug picks and patio rug picks both rank drainage above appearance for exactly this reason.

Specific stains

Storing it for winter

The single most common cause of a ruined outdoor rug is not use, it is storage. A rug rolled up while still damp and put in a sealed bin for four months will come out with mold in it and a smell that will not leave.

• Clean it, then dry it completely — both faces, until there is no cool damp feel anywhere in the weave.
• Roll, do not fold. Folds set permanent creases in polypropylene and stress the backing on a woven rug.
• Store somewhere ventilated and off the floor. A garage shelf, not a basement floor. If you use a bag, leave it open.
• Add a desiccant pack if you are storing it anywhere with humidity, and check it once mid-winter.

Flat plastic-straw rugs fold down to almost nothing, which is one of their quiet advantages over a woven rug in a small house.

Protecting whatever is underneath

Cleaning the rug and protecting the deck are the same job. A rug that stays damp on decking will discolor the boards — on wood it breaks down the finish and in shade accelerates rot; on composite it leaves an outline that does not weather out. Lift the rug after heavy rain, sweep underneath monthly, shift it a few inches each season so the same board edges are not permanently covered, and keep rubber-backed rugs off decking altogether.

Do that and the cleaning routine above becomes a twice-a-summer chore rather than a rescue operation.

More from this hub: furniture & decor · best outdoor rugs · best patio rugs · how to clean a large area rug at home · how we rank.