A bounce house that goes into storage wet or dirty in October can come out in March with mold colonies, rotted seams, and odors that no amount of cleaning will fix. Proper winterization takes a few hours per unit but saves hundreds — or thousands — in repairs.
Step 1: Deep Clean Before Storage
Never store a bounce house that hasn't been thoroughly cleaned. After your last event of the season:
- Set up the unit fully inflated in a clean area (garage, driveway, backyard)
- Spray the interior and exterior with a diluted cleaning solution (1 part bleach to 10 parts water works well for mold prevention; commercial inflatable cleaner is also available)
- Scrub all surfaces with a soft brush, paying extra attention to the jump surface, slide lane, and any mesh panels
- Rinse completely with clean water — bleach residue left on vinyl can cause degradation over time
- Wipe down all surfaces with a clean dry towel to speed drying
Step 2: Dry Completely — This Is Critical
This is where most storage damage happens. Any moisture that goes into a storage bag will breed mold and mildew over the winter. The vinyl becomes a sealed environment — perfect conditions for rapid mold growth.
After washing, keep the unit fully inflated for 2–4 hours minimum on a sunny, low-humidity day. Use a leaf blower to force air through all enclosed areas. Check inside seams, inside the blower tube attachment, and under any overlapping panels. If you can't get a dry day, bring the unit indoors inflated until it's fully dry. Do not rush this step.
Step 3: Inspect Every Seam and Surface
With the unit inflated and dry, do a full visual inspection before folding:
- Check all seams for delamination, separation, or thin spots
- Look for small punctures or abrasions — patch them now while you have time and access to the material
- Test the blower — run it for 5 minutes and listen for bearing noise or unusual heat
- Inspect anchor points for wear
Patching small issues in the off-season costs $20 in materials. Dealing with a failed seam at your first spring event costs a refund, lost reputation, and emergency repair fees.
Step 4: Fold and Bag Correctly
Deflate the unit completely and allow all air to escape before folding. Fold in a consistent pattern — most manufacturers include folding diagrams. Keep the fold lines consistent year to year to avoid excessive stress on the same seams repeatedly. Place the blower and stakes inside the bag with the unit. Do not stack heavy objects on top of bagged inflatables in storage.
Step 5: Storage Environment Matters
Store inflatables in a climate-controlled environment if possible. Extreme cold (-20°F and below) can make vinyl brittle. Extreme heat (140°F+, such as a metal storage container in summer) can soften vinyl and cause seam adhesive to weaken. A garage that stays above freezing in winter and below 100°F in summer is ideal. Keep units off bare concrete floors — place them on pallets or shelving to prevent moisture wicking up from the floor.
Spring Startup Checklist
Before your first booking of the season: inflate the unit, do a full inspection, run the blower for 20 minutes, and check all seams under pressure. Any issues that developed over winter are better discovered before a customer's event than during one.
