If you’ve ever opened a vehicle after it’s been sitting for a while you’ll know how quickly mould and mildew can take hold.

At Big Boys Toy Storage, we can at times see how tropical conditions, humidity, and long periods of inactivity can lead to unwanted surprises for vehicle owners. The good news? With the right preparation, mould and mildew are almost entirely preventable.

Here’s a complete guide on how to properly prepare your car or caravan for storage and keep it fresh, dry, and ready to go when you need it.

Mould and mildew thrive in three conditions:

• Moisture
• Warmth
• Lack of airflow

Unfortunately; a stored vehicle especially in humid climates such as QLD or the NT ticks all three boxes.

Even small amounts of moisture (a damp floor mat, a drink spill, or humid air trapped inside) can lead to mould growth over time.

Step 1: Check Seals for Leaks

Before storing:

• Inspect door seals and window seals
• Check for any signs of water ingress
• Fix leaks early

Even a small leak can introduce ongoing moisture into the cabin.

Step 2: Give It a Proper Deep Clean

Before storing your vehicle, a thorough clean is essential.

• Vacuum carpets, seats, and under mats
• Remove all rubbish and food (even crumbs matter)
• Wipe down all surfaces with antibacterial cleaner
• Clean cup holders and storage compartments

Why this matters:

Organic material (food, dirt, dust) feeds mould. A clean interior removes the environment mould needs to grow.

Step 3: Completely Dry the Interior

This is one of the most important—and most overlooked—steps.

After cleaning:

• Ensure carpets and upholstery are completely dry
• Avoid storing the vehicle if it’s been recently wet (rain, beach trips, cleaning)
• If needed, leave doors open in a dry area or run the air conditioning to remove moisture

Even slight dampness can turn into mould over time.

Step 4: Remove All Moisture Sources

Before storage, check for anything that could introduce moisture:

• Wet towels, clothes, or gear
• Damp floor mats
• Water bottles or liquids
• Esky/coolers that haven’t been dried

For caravans:

• Empty water tanks if not needed
• Check bathrooms and sinks are dry
• Leave fridge/freezer clean and dry (door slightly open if possible)

Step 5: Book a Professional Detail (Optional but Recommended)

If you want complete peace of mind, a professional detail before storage is a smart move.

Detailers:

• Remove hidden dirt and contaminants
• Ensure proper drying
• Apply protective treatments

At Big Boys Toy Storage, we can also organise mobile detailing services to prepare your vehicle before or after storage.