Prep first
Before you start
- Let the mud dry, then brush, scrape or vacuum off as much as possible.
- Rinse what is left with cold water.
- Sweep away debris and spray nearby plants with water before you start.
Mud splashed onto siding is soil that settles into the texture of the surface, so most of it brushes off once it's dry. What's left usually lifts when you work cold water and a gentle soap into it with a bristle brush. Wood and other siding materials don't all handle force the same way, so test your cleaner in a hidden spot and use extreme caution with a pressure washer.
Mud stains on vinyl siding usually need a second pass, not a harder push. Let the cleaner sit briefly so it can loosen the grime before you rinse. If the marks are still there after an oxygen bleach powder treatment, a professional can take it from there.
Before you start
What siding, roof & exterior can take
Safe to use2
- Water
- Oxygen bleach
Use with care5
- Soaking
- Chlorine bleach
- Solvents (alcohol, spot removers)
- Acids (vinegar, lemon)
- Scrubbing and abrasives
6 items
What you'll need
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- Soft brush or clothScrubs vinyl and fiber cement without marking the surface. (opens Amazon)
- Garden hoseGives the cold water rinse at low pressure.
- Mild dish detergentThe cleaner for the main scrub. (opens Amazon)
- Plastic drop clothProtects nearby plants from overspray. (opens Amazon)
- Stiff synthetic-bristle brushNeeded only for wood siding, used along the grain. (opens Amazon)
- Oxygen-bleach cleanerFor black spots that stay after the scrub. (opens Amazon)
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5 steps
Step by step
Step 1 of 5
Let the mud dry and brush it off
Wait until the mud is fully dry, then brush, scrape or vacuum off as much as you can. Sweep away leaves and debris first, and cover nearby plants with a plastic drop cloth, spraying them with water to dilute overspray.
Careful. Don't rub wet mud in; blot and let it dry first.
Step 2 of 5
Rinse off what is left
Rinse the remaining mud with cold water from a garden hose on low-pressure spray. Keep the spray moving so loosened soil runs off the siding instead of settling back into it.
Step 3 of 5
Test the cleaner in a hidden spot
Before you treat the whole wall, test your cleaner, and any pressure washer setting, on a small inconspicuous area. Check the spot once it is dry to see whether the siding looks the same as before.
Step 4 of 5
Scrub gently with mild dish detergent
Mix mild dish detergent into water and scrub the mud with a soft brush, working in small sections. On fiber cement, a soft cloth does the same job.
Step 5 of 5
Rinse thoroughly with the hose
Rinse each cleaned section with the hose until no soap or grit remains. Run your hand over the siding afterward; any gritty film means it needs another rinse.
Careful. Don't let cleaners or soap dry on the siding.
If you'd rather buy than mix
Best products for mud on siding, roof & exterior
Pick an oxygen-bleach cleaner labeled for siding, and test it on a hidden spot before using it on the black marks.
OxiClean Versatile Stain Remover Powder
How we picked these: each product is made for this type of stain, its maker doesn't warn against using it on siding, roof & exterior, and its directions fit the steps above.
Finished the steps? How does it look?
Nice work. Let it dry completely and check it again in good light. Here is what done looks like:
How to tell it's really gone →A faint mark usually needs one more round, not a stronger product.
Heavy buildup usually takes more than one round.
Heavy or long-standing buildup →When to call a professional →How to tell it's working
The mud is gone when the siding matches the area around it and feels smooth under your hand. If a spot still looks dull or darker after rinsing, don't let it dry; repeat the scrub and rinse on that spot.
What changes for yours
Adjust for your siding, roof & exterior
Wood siding
Wood takes a stiff synthetic-bristle brush run along the grain, where vinyl and fiber cement take a soft brush. If you pressure wash wood, use the lowest pressure that cleans, with a fan tip.
Reddish-brown tannin bleed and rust streaks need an oxalic-acid wood brightener, used per its label. It also neutralizes oxygen cleaners, so rinse those off before you use it.
Fiber cement siding
Fiber cement takes a soft brush or cloth and a low-pressure hose rinse, and the scrub stays gentle. Use the hose instead of a pressure washer for the rinse.
If the marks look like mildew, switch to a mildew-specific cleaner applied with a soft cloth rather than a harder scrub.
Black spots
Black spots on siding can be mildew rather than mud, so check whether the scrub changed them before reaching for anything stronger. Most of the time, a second scrub and rinse is enough.
If they stay, use the oxygen-bleach step from the set-in section, since it is the stronger option that these surfaces can take.
Pressure washer
A pressure washer belongs on wood only, at the lowest setting that cleans. Test the setting on a hidden spot first and use a fan tip, spraying along the grain.
For vinyl and fiber cement, stick with the hose and the soft brush.
Weathered or grayed wood
Gray wood can often be restored with a commercial deck cleaner, brightener or restorer, which removes mildew and dirt so the wood's own color shows. If all the natural color has leached out, the wood stays silver when dry, and that is its normal look.
Old stain or sealer needs a stain and sealer remover, then a brightener, then a light sanding once the wood is dry. Leave the silver fibers in place rather than sanding harder.
Heavy or long-standing buildup
Mud that has sat on siding for weeks can bond to the surface and survive a single scrub. Let it dry fully before you start, since dried soil is easier to brush away than soft mud.
If black spots remain after the scrub, apply an oxygen-bleach cleaner in sections and keep it wet for the label's dwell time, about 15 minutes. Scrub along the grain on wood, or use a mildew-specific cleaner with a soft cloth on fiber cement, then rinse fully.
If the spot is still there after one round, repeat the scrub and rinse once rather than stacking stronger products. Some marks don't come out, and a faint shadow left on the siding is a realistic result.
Vinegar, baking soda, peroxide and more
Do home remedies work on mud on siding, roof & exterior?
Plenty of kitchen remedies come up for stains, but most of them are built for fabric or food spills rather than siding. Mild dish detergent is the only cleaner that belongs on siding, and each of the others has a reason to skip it.
Works1Helps1Skip4Avoid1
What makes it worse
Mistakes to avoid
Don't pressure wash vinyl siding upward
Vinyl siding can be damaged when a pressure washer is aimed upward at it. Keep the spray moving downward and test any setting on a hidden spot first.
Don't use harsh solvents on vinyl
Organic-solvent cleaners, undiluted chlorine bleach, liquid grease remover, nail polish remover and furniture polish are all off the list for vinyl. Stick with mild dish detergent and water for the scrub.
Don't mix bleach with ammonia or other removers
Chlorine bleach mixed with ammonia gives off a toxic gas, and mixing it with vinegar or other removers is risky too. If you need more than one product, rinse thoroughly between them.
Don't scrub fiber cement or wood too hard
A hard metal brush or an abrasive sponge can scratch the finish on fiber cement. On wood boards, steel wool or wire brushes leave iron that stains the grain.
When to call a professional
Stop if the mud has stayed after the gentle steps and the set-in step, or if the finish looks dull, chipped or damaged. A pro siding cleaner can judge the surface in person and handle what a hose and soft brush can't.
Questions
How long should mud dry before I clean it?
Let it dry fully, then brush it off. Check that it is dry and crumbly before you start, because soft mud is harder to clear.
Can I use vinegar or rubbing alcohol on mud on siding?
No, you don't need either one. Vinyl siding can't take organic-solvent cleaners like rubbing alcohol, and mild dish detergent covers the scrub without vinegar.
Will bleach remove black spots from siding?
Not as a first step. Undiluted chlorine bleach is off the list for vinyl, so use an oxygen-bleach cleaner for black spots that stay after the scrub and rinse.
How do I clean fiber cement siding without damage?
Use mild dish detergent in water with a soft brush or cloth, then rinse with a low-pressure hose spray. Keep harsher tools and products off the surface.
Can mud come out of gray wood siding?
Often, yes. Scrub along the grain with a stiff synthetic-bristle brush, but if the wood has gone fully silver, cleaning won't bring the color back.
What if the stain is still there after cleaning?
Use the set-in step: an oxygen-bleach cleaner kept wet for about 15 minutes, then scrubbed and rinsed. If it still shows, it is likely a lasting mark, and a professional cleaner can judge it.
Mud on other materials
Other stains on siding, roof & exterior
Start from the bigger picture
How we know this
Every method, amount and warning here comes from university extension services, industry bodies and product makers. We read them, check every step for unsafe combinations and changed amounts, and write it up so you can follow it.