How to Clean the Outer Shell of an Acrylic Spa Hot Tub?

Acrylic spa hot tubs are widely used in outdoor spas due to their lightweight, aesthetic appeal, corrosion resistance, and excellent heat retention. Whether it's a relaxing tub in a home patio or a multi-functional spa device from a high-end brand, the outer shell is mostly made of acrylic.

Despite its durability, improper external cleaning can still lead to scratches, loss of shine, dirt buildup, and even affect its overall lifespan.

Therefore, "How to clean the outer shell of an acrylic spa hot tub?" is an important skill for many users. Understanding the correct cleaning methods can ensure the acrylic spa hot tub remains in optimal condition, extends its lifespan, and maintains hygiene, safety, and aesthetics.

This article will systematically and meticulously answer this question, providing you with readily implementable cleaning methods and professional advice that will not damage the tub.

What is an acrylic spa hot tub outer shell? Why does it require special cleaning?

The outer shell of an acrylic spa hot tub is typically constructed from high-density acrylic sheets reinforced with a fiberglass layer. These materials boast advantages such as smoothness, aesthetics, high gloss, and excellent water resistance, allowing them to withstand long-term outdoor environments.

However, it is precisely this smooth, glossy characteristic that makes them sensitive to certain cleaning methods. If the cleaning method is not chosen correctly, acrylic surfaces are prone to the following problems:

• Minor scratches

• Surface haze

• Color fading

• Chemical corrosion

• Decreased gloss

This is why it is crucial to follow the correct methods when cleaning the acrylic spa hot tub casing, avoiding the use of incorrect tools or cleaning agents.

Is cleaning the acrylic spa hot tub casing really that important?

Yes, it is very important. Proper cleaning has the following benefits:

1. Maintaining an attractive appearance

Acrylic surfaces are known for their gloss; once the gloss is lost, the overall quality is significantly reduced.

2. Extending the lifespan of the hot tub

Cleaning the casing reduces oxidation and corrosion caused by prolonged exposure to wind and sun.

3. Preventing bacterial buildup

Outdoor dust, air pollutants, and rainwater residue can all cause dirt buildup and bacterial growth.

4. Maintain Equipment Value

A well-maintained acrylic spa hot tub will have a higher resale value.

What do you need to prepare before cleaning the acrylic spa hot tub casing?

Before you begin cleaning, it is recommended to prepare the following tools and supplies. These are all safe choices for acrylic materials:

Recommended Safe Cleaning Products:

• Mild neutral detergent

• Acrylic-specific cleaner (optional)

• Warm water

• Soft microfiber cloth

• Sponge (non-abrasive type)

• Soft-bristled brush

Please avoid the following tools:

• Metal brush

• Scouring pad (rough abrasive surface)

• Cleaners containing bleach or ammonia

• Sandpaper

• Strong acid or alkali cleaners

These prohibited items can easily damage the acrylic surface, causing scratches or chemical reactions.

How to clean the acrylic spa hot tub casing step by step? (Core Steps)

The following is the most recommended and safest cleaning procedure for the acrylic spa hot tub casing:

Step 1: Rinse the Surface

Rinse the casing with clean water to remove loose dust, sand, and fallen leaves, avoiding scratches caused by dry wiping.

Special Note:

In outdoor environments, fine sand particles often adhere to the surface; rinsing first is essential to prevent scratching the acrylic during wiping.

Step 2: Prepare a Mild Cleaning Solution

Add warm water and a small amount of neutral detergent to a bucket and gently stir to create foam.

Why use a neutral detergent?

Because acrylic is sensitive to strong acids and alkalis; neutral detergents will not damage the surface.

Step 3: Wipe the Casing with a Soft Sponge

Soak a sponge in the cleaning solution, then gently wipe the entire acrylic spa hot tub casing.

Precautions:

• Do not apply excessive force.

• Wipe slowly and evenly.

• Avoid making small circles or excessive rubbing.

Step 4: Treating Stubborn Stains

If there are stubborn stains (such as watermarks or dirt) in certain areas of the casing, use a soft-bristled brush to gently brush them.

Do not use hard brushes or sharp tools, as these will scratch the acrylic surface.

Step 5: Rinse Thoroughly with Water

Rinse off all cleaning agent residue to prevent color changes or loss of shine.

Step 6: Dry the Surface to Prevent Watermarks

Use a clean microfiber cloth to dry the surface. Microfiber cloths will not scratch acrylic and are the best choice.

Step 7: Optional—Polishing with Acrylic Care Agent

To make the casing even shinier, use an acrylic-specific polishing agent. The effects are noticeable:

• Increased gloss

• Added protective layer

• Reduced future dirt adhesion

What should be avoided when cleaning the acrylic spa hot tub casing?

This is an area where many people make mistakes, making it crucial.

Which cleaning agents will damage acrylic?

Avoid any of the following products:

• Chlorine bleach

• Ammonia-based cleaners

• Strong acid cleaners

• Oven cleaners

• Solvents with high alcohol content

These ingredients will make the acrylic surface rough, white, and even crack.

Which tools will scratch acrylic?

Must avoid:

• Steel wool

• Metal scrapers

• Sandpaper

• Coarse-grit sponges

• Hard brushes

Can a high-pressure water gun be used on the acrylic spa hot tub casing?

It is not recommended to use a high-pressure water gun at close range on the casing because:

• Excessive water pressure can damage the acrylic structure

• It can easily seep into the bathtub rim seals

• It may cause long-term leaks

If used, maintain a distance and reduce the pressure.

How often should the acrylic spa hot tub casing be cleaned?

Optimal cleaning frequency depends on the usage environment:

1. Typical home backyard (low dust)

Basic cleaning every 2–4 weeks

2. Outdoor garden, areas with high winds and dust

Cleaning every 1–2 weeks

3. Families who frequently use hot tubs

Quick wipe-down recommended weekly

4. When not in use for extended periods

Regular dusting or checking for water accumulation and stains is recommended.

Regular cleaning helps maintain the shine of the casing.

How to further maintain the acrylic spa hot tub casing after cleaning?

In addition to regular cleaning, you can extend the life of the casing by:

1. Using a protective cover

When the hot tub is not in use, covering it with a dust and UV protection cover can reduce dust accumulation.

2. Avoiding prolonged exposure to sunlight

Strong UV rays accelerate acrylic aging; consider using an awning or parasol.

3. Regularly checking the casing condition

If you find minor cracks or fading, repair or polish it promptly.

What to do if the acrylic spa hot tub casing loses its shine?

If the casing has slightly lost its shine, you can restore it using the following methods:

• Acrylic polishing compound

• Fine care product

• Dedicated acrylic repair tool kit

However, if the problem is severe, it is recommended to consult a professional manufacturer for treatment.

What is the best way to clean the casing of an acrylic spa hot tub?

In short:

1. Rinse → Remove dust

2. Clean with neutral detergent and warm water

3. Use a soft sponge

4. Use a soft-bristled brush for stubborn stains

5. Rinse thoroughly

6. Dry with a microfiber cloth

7. Optional: Use a polishing compound

By following these steps, your acrylic spa hot tub will remain beautiful, clean, and safe for a long time.