How to Clean Window Sills (Exteriors Included!)

by | Mar 28, 2023 | Detailed Cleaning

Oft forgotten and dismissed as inconsequential, window sills endure chronic negligence in terms of cleanliness.

The mindset:  a flawed notion, holds that they’re hidden from view, thus absolving them of the need for cleansing. Yet, these narrow ledges, equally as begrimed as any other domestic nook, bear the brunt of environmental insults.

In this missive, we impart the means of purifying both the interior and exterior window sills.

Window Sills, often regarded as a neglectful afterthought, can soon become a labyrinth of grime and filth, which not only afflicts one’s sight but also imposes a threat to their longevity. As time passes, the accretion of dirt may lead to rot, mold, or even demand a hefty sum for its repair. Hence, it’s imperative to keep these skills shining and immaculate.

The aesthetic benefits of spotless window sills are apparent.

  • They impart a look of neatness and upkeep to one’s abode. But the true significance lies in their preservation.

  • Regular cleansing will prolong their existence, preserving the paint and finish from being devoured by the unclean masses.

1. Begin by sweeping the surface of the window sill with a cloth or paper towel.

  • Ensure to access all crevices.

  • After dusting, sanitize the surface with vinegar diluted in warm water.

2. For exterior sills, the initial step involves the removal of any loose paint or caulking with a putty knife and screwdriver.

  • Take heed not to harm the wooden surface beneath.

  • Once the remnants are discarded, wipe the surface with a damp cloth or paper towel, and then clean with vinegar diluted in warm water.

3. After the cleaning process, dry the window sill with a clean cloth or paper towel.

  • Apply glass cleaner to a new cloth or paper towel, and buff the surface until it gleams.

  • On the exterior window sill, seal any gaps with fresh caulk and paint over any bare patches (if desired).

  • Allow the paint to dry completely before adding any decor or furniture back to the sill.

OUTDOOR WINDOW SILLS, exposed to the elements, pose a greater challenge for cleaning. Yet, it’s imperative, especially for those residing in areas with high humidity or rain.

1. A power washer is the best option for cleaning outdoor window sills. Connect the power washer to your hose, set it to a low-pressure setting, and hold the nozzle about a foot away from the sill while slowly moving it back and forth across the surface.

2. Climb up to the window sill and remove any loose dirt or debris with your hands. Mix warm water and dish soap in a bucket and use a sponge or brush dipped in the soapy water to scrub the surface of the window sill. Rinse it off with a garden hose.

3. Finally, dry off the sill with a clean towel. For any persistent stains, use a mild cleaning solution (such as dish soap and water) to eradicate them.

In this sphere of glass, frames and ledges, different varieties of window sills demand their own unique means of ablution. Allow us to guide you through the processes of purifying each:

  • Wooden window sills, in their natural grain, should be caressed with a cloth of microfiber or whisked with a feather duster. If sullied beyond measure, a solution of soap and water, mild in nature, can be employed. Yet, take heed to ensure a proper drying, lest the wood warp or rot.

  • Aluminum window sills, in their metallic gleam, can be wiped with a cloth dampened and then dried with a soft towel. For those stains that refuse to relinquish their hold, a mild abrasive cleaner may be called upon. Handle with care, as to avoid any scratches to the surface.

  • Vinyl window sills, in their synthetic hue, can be sponged or brushed with soapy water and then rinsed with a cloth that is clean and damp. Thorough drying is imperative, as to avoid any residue.

  • Glass window sills, in their clarity, should be treated with a glass cleaner and a cloth of the softest fiber. Wipe in the direction of the grain, lest streaks mar the pristine surface.

Window sill care, a task most frequently neglected, yet an essential chore to preserve the beauty and hygiene of your abode.

Follow these steps, and the task shall not seem a burden:

1. Inspect your arsenal; a bucket, a soap with a mild temper, a cloth or sponge, water warm as a summer’s day, vinegar undiluted, baking soda, and a brush. For stubborn stains, arm yourself with a mixture of baking soda and water, let it rest for a spell, then attack with the brush.

2. For routine cleaning, a blend of soap and warm water will suffice. Dab the cloth or sponge in the mixture, then apply to the sill, being mindful of every nook and cranny. Rinse with clean water and dry with a cloth, leaving no trace of moisture behind.

3. For more tenacious grime, vinegar diluted with warm water is the potion you seek. Again, apply with cloth or sponge, rinse, and dry.

4. For exterior window sills, a ladder, a putty knife, a screwdriver, and gloves may also be required. Remove loose paint or caulking with care, using the putty knife and screwdriver. Wipe down with vinegar diluted with warm water and dry with a cloth. Apply fresh caulk and paint if necessary, then bask in the glow of a job well done.

Clean window sills, like a freshly washed face, bring clarity and beauty. Perform this task once a month or more frequently if you reside in a place where the winds carry dust and pollen. And never forget, the key to success is elbow grease and the right supplies.

Remember if you already clean your window sills,  at the same time clean windows and window screens to enjoy the beautiful view in the morning from your transparent window.

Fissures, Fractures, and Frailties

Shall thy window ledge be marred with cracks, chips, or any other manner of harm, it is advisable to mend it prior to its ablution. To neglect this cautionary step would result in exacerbation of the affliction.

A tonic of wood filler can heal petty fractures and chips, simply apply it to the affected area and let it bask in the dry air. Yet, in the case of more severe damage, a replacement of the entire ledge may be necessary.

The window ledge, too, can become a haven for mold fragments and mildew. If thou shouldst spy any such menace, act quickly to expunge it.

A potion composed of equal parts of water and vinegar will do the trick:

  • Apply the elixir with a sponge or brush, allowing it to steep for a few moments before rinsing it away with pure water.

  • Dry the ledge with a cloth, lest the mold beast or dampness return.

Should thy window ledge bear stains, fear not, for there are household remedies to remove them?

  • Vinegar, baking soda, or even toothpaste can be utilized.

  • Simply apply the chosen potion to the stain, then gently scour it with a sponge or brush.

  • Rinse away the cleaner with pure water and dry the ledge with a cloth.

Even with frequent cleanings, the window ledge may lose its luster and appear worn. In such instances, sand the surface, and then grant it a new visage with a coat of paint or stain.

Bicarbonate and Acidic Elixir

Let fall a sprinkle of bicarbonate upon the sill of the window. Anoint with a few drops of acidic elixir, then wield an ancient toothbrush to scour the grime with fervor. Rinse with the fluid of life and dry with a spotless cloth.

Citrus Ambrosia

Gush forth fresh citrus ambrosia upon the sill of the window. Employ the ancient toothbrush in a fervent scouring of the grime. Rinse with the fluid of life and dry with a spotless cloth.

Crystalline Granules

Cast a shower of crystalline granules upon the sill of the window. Wield the ancient toothbrush in a fervent scouring of the grime. Rinse with the fluid of life and dry with a spotless cloth.

The stained window sills loom, with dust a-gathering and pests at play! Fear not, for with these tips ye shall banish grime and restore a gleaming ray:

  • Commence by banishing any loose dirt with a gentle swipe of a plume duster, microfiber cloth, or a sheet from a clothes dryer’s bosom.

  • Should a stubborn stain persist, prepare a baking soda paste with water, apply it to the affront, and let it bask for a quarter hour before wiping it away.

  • For the tenacious taints, a more potent cleaner may be required. Take care to perform a spot test in a discreet area and follow the instructions of the manufacturer with great care.

  • Upon completion, protect the window sills with a coat of wax or furniture polish, warding off future dirt and dust.

  • For the exterior windows, bestow upon the sills a thorough rinse with a hose or pressure washer.

Always remember about the importance of regular windows, window sills etc. cleaning as it saves your time in futere.

This a tedious task, cleaning, but fear not! Housecleaning in Stanwood is here to save time! Avail thyself of our professional house cleaning services, which shall leave thy abode aglow. Contact us for a free estimate, and bask in a clean home today!


Let us wow you with our phenomenal maid services, and relax while we take care of your home, all while knowing you are helping a wonderful cause.

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