How to remove stains from PVC decking?

PVC decking (polyvinyl chloride decking) is a popular choice for outdoor spaces due to its durability, low maintenance, and resistance to rot, mold, and insects. While it’s designed to be tough, even the most resilient vinyl decking can get stained. Understanding how to tackle different types of stains is key to keeping your deck looking its best for years to come.

General Cleaning Tips Before You Start

Before you apply any specific stain remover, it's always a good idea to perform a general cleaning of your PVC deck. This helps remove loose dirt and grime, making it easier to identify and treat the stains.

• Sweep it: Use a soft-bristle broom to remove leaves, dirt, and other debris.

• Wash it: Mix a mild soap, like dish detergent, with warm water. Use a soft-bristle brush or a sponge to scrub the deck surface gently.

• Rinse it: Rinse the deck thoroughly with a garden hose. Avoid using a high-pressure washer, as the force can damage the surface of your PVC deck boards. If you must use a pressure washer, use a fan nozzle and keep the pressure below 1,500 PSI.

Removing Common Stains from Your PVC Decking

Different types of stains require different approaches. Here’s a breakdown of how to handle the most common culprits.

1. Grease, Oil, and Food Stains

These are a common problem, especially around grills and dining areas.

• Mild solution: For fresh stains, a mixture of warm water and dish soap often works wonders.

• Stronger solution: If the stain has set, you may need a specialized degreaser. Look for a deck cleaner designed specifically for synthetic decking or a household cleaner that is safe for vinyl. Apply the cleaner directly to the stain, let it sit for a few minutes, then scrub with a soft brush and rinse thoroughly.

2. Rust Stains

Rust stains often come from metal furniture or other objects left on the deck surface.

• Rust remover: Use a rust remover designed for use on plastic or synthetic surfaces. Avoid using harsh acids like muriatic acid, as they can permanently damage the color and finish of your PVC deck. Follow the product instructions carefully.

• Homemade solution: A paste made from lemon juice and salt can also be effective. Apply it to the rust stain, let it sit for a while, and then scrub and rinse.

3. Mold and Mildew Stains

While PVC decking is mold-resistant, dirt and organic debris that sit on the surface can still host mildew and mold growth.

• DIY cleaner: A solution of oxygen bleach (like OxiClean) mixed with water is a great option. Apply the solution to the affected area, let it sit for 10-15 minutes, then scrub with a soft brush and rinse well.

• Commercial cleaner: There are also many commercial deck cleaners available that are specifically formulated to kill mold and mildew without harming your plastic decking.

4. Scuff Marks and Black Marks

These marks are typically caused by shoes or furniture.

• Eraser: For light marks, a magic eraser can be surprisingly effective.

• Cleaner: For more stubborn scuffs, use a cleaner designed for vinyl surfaces. A soft-bristle brush can help work the cleaner into the mark.

A Word of Caution: What to Avoid

To protect your investment and maintain the integrity of your poly decking, steer clear of these common mistakes:

• Avoid using harsh chemicals: Never use abrasive cleaners, scouring powders, or harsh solvents like acetone or paint thinner. These can damage or discolor the surface of your PVC deck boards.

• Don’t use metal tools: Avoid using wire brushes, scrapers, or other metal tools that can scratch and permanently mar your composite decking surface.

• Beware of oil-based products: Never use cleaners or treatments that contain lanolin or other oil-based ingredients, as they can leave a residue that attracts dirt and can be difficult to remove.

The Importance of Prompt Action

The best way to prevent permanent stains is to act quickly. The sooner you treat a stain on your PVC decking, the easier it will be to remove. By following these professional tips, you can keep your outdoor living space beautiful and extend the life of your synthetic decking for years to come.