Maintaining a wooden deck isn’t always easy, and if you’re having a hard time keeping yours clean, you may want to try using sodium metasilicate. This chemical may not be a household name, but it’s extremely effective for cleaning wood surfaces. Despite its complex title, it’s actually very easy to use. Read on to learn more about what sodium metasilicate is, how to use it effectively, and how it compares to other wood cleaners.
What Is Sodium Metasilicate?
Sodium metasilicate is a versatile cleaning agent that homeowners can either use on its own or as an active ingredient in other cleaning products. It’s a type of alkali salt that’s capable of getting rid of moss, mold, and other organic growths that can accumulate on wood over time, making it perfect for cleaning outdoor wooden structures like decks. Aside from cleaning, you can also use sodium metasilicate to strip wooden decks, preparing them for a new coat of paint, varnish, or sealer.
How To Use Sodium Metasilicate for Deck Cleaning
Sodium metasilicate is only effective if you use it correctly and follow the right steps for application. Here are some tips for using sodium metasilicate for cleaning:
1. Prepare Your Deck
Before you apply sodium metasilicate for cleaning, you’ll need to prepare your deck surface. Start by removing all your furniture and decorations from the deck so they don’t get any damage from chemical exposure. Then, use a garden hose or a pressure washer (at low or medium pressure) to wash away surface dirt and debris. After you rinse it down, check your deck for any damaged boards or protruding nails. If you need to do any repairs, now’s the time to do them before you start cleaning.
2. Mix the Cleaning Solution
Sodium metasilicate typically comes in powder form, so you’ll need to create your own cleaning solution. However, if you do it incorrectly, you could damage the wood surface, so pay close attention to the proportions.
To make a sodium metasilicate cleaning solution, combine 1/4 to 1 cup of sodium metasilicate with 1 gallon of water in a large container and stir it together. The exact amount that you need may vary based on the size of the deck and how old the stains are. When in doubt, start with a less concentrated solution and test it on an inconspicuous area of the deck. If it doesn’t take away the stains, gradually increase the concentration until you get the results you want.
3. Apply the Cleaner
Once you mix it, it’s time to apply the sodium metasilicate solution to your deck. Evenly distribute the solution across the deck’s surface using a mop, brush, or sprayer. Make sure that you cover the entire deck.
Allow the solution to sit on the wood for 15 to 20 minutes to penetrate and loosen dirt and stains. After the time is up, scrub the deck with a stiff brush. If any areas still have stains on them after scrubbing, you can repeat the process for stubborn spots. Once you’re done scrubbing, rinse the deck with clean water to prevent any chemical residue from lingering.
How To Use Sodium Metasilicate for Deck Stripping
If you want to use sodium metasilicate to strip an old finish from your deck, the steps are a bit different. For stripping, use a higher concentration of sodium metasilicate (up to 1 cup per gallon) in the cleaning solution, mixing it using the same steps in the section above. Apply this solution across the entire deck surface. Then, let it sit for an hour. After the hour, rinse the deck thoroughly. Spot clean as necessary to remove all traces of the old finish.
Safety Precautions When Using Sodium Metasilicate
Sodium metasilicate is a powerful cleaner, so we recommend prioritizing safety. When in doubt, refer to this safety data sheet from West Liberty University. Wear protective gear, such as gloves, eye protection, and proper clothing, when dealing with sodium metasilicate. Always keep children and pets away from the area during cleaning until the deck is completely dry and safe.
Sodium Metasilicate Vs. Other Wood Cleaners
Sodium metasilicate is an effective wood-cleaning chemical, but it’s not the only option on the market. In fact, there are some situations where other chemicals would be better for the job. Weigh the options below to see if sodium metasilicate is the best choice for your specific cleaning task:
Oxalic acid is known for its wood-brightening properties, making it an excellent choice for restoring your deck’s natural vibrancy. It brightens raw wood more effectively than sodium metasilicate and can also neutralize the pH of wood after cleaning.
Also known as lye or caustic soda, sodium hydroxide stands out for its superior strength as a cleaning agent. However, it’s more corrosive than sodium metasilicate, so it’s best for stripping thick finishes.
Given its potential to harm wood, we don’t recommend it for general wood cleaning tasks. Instead, use it for specific stripping jobs.
Oxygen bleach serves as a subtler alternative to chlorine bleach. It’s safe for most wood types without risking discoloration, and it’s effective at removing mold, mildew, and algae. It’s also gentler on wood fibers compared to more aggressive chemicals, but it may require longer exposure time for stubborn stains.
When To Choose Sodium Metasilicate
Sodium metasilicate is a versatile cleaning agent, but it’s best for general deck maintenance and cleaning. If you need to remove moderate stains and discolorations, get rid of black mold on your wood deck, or strip it for a new coat of paint, it’s the right choice.
However, for specific tasks like enhancing wood brightness, stripping heavy finishes, or cleaning your deck without harming the wood, chemicals like oxalic acid, sodium hydroxide, or oxygen bleach may be a better fit.
