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A musty smell when you open the tent bag is a reason to unpack and inspect the tent before your next trip. Cleaning may help the odour, but it cannot automatically reverse damaged waterproof coatings or remove every stain. Assess the fabric as well as the smell.
Table of Contents
Unpack somewhere suitable for inspection
Choose a well-ventilated space where the tent can be spread out without scraping its coating. Check the flysheet, inner, floor, seams and storage bag. Note visible spotting, sticky or peeling surfaces, and areas that feel unusually weak.
Keep the care label and manufacturer’s instructions at hand. Different tent fabrics and coatings need different treatments. Avoid starting with a household bathroom mould spray simply because mould appears in its name.
Follow the tent maker’s cleaning rules
MSR’s tent-care guidance recommends gentle hand cleaning and warns against harsh cleaners and machine washing. Use the method approved for your tent, including the cleaner, water temperature and rinsing procedure.
Do not scrub aggressively to chase a remaining mark. A permanent stain and active contamination are not the same thing, and abrasion can create fresh damage. If the coating is deteriorating across a large area, ask the maker about its repairability before spending time and money on treatments.
Consider a compatible odour treatment
GEAR AID Revivex Odor Eliminator, formerly called MiraZyme, is intended for odours in outdoor equipment including tents. Check that your tent manufacturer permits the treatment and follow the directions on the actual bottle.
The GEAR AID MiraZyme listing on Amazon UK uses the older name. Confirm the supplied formulation and instructions rather than transferring a dose from a different bottle size. An odour treatment is not a replacement waterproof coating or a guarantee that weakened fabric is sound.
Dry everything and check again
Allow the tent and its bag to dry completely in the manner the manufacturer recommends. Pay attention to folds, seams and areas that remain shaded or enclosed. Do not compress it for storage while those sections are still damp.
Once dry, inspect the fabric and pitch the tent before relying on it for a trip. Deal with any separate seam or coating problem through the appropriate repair process. After future wet pack-downs, unpack promptly at home and dry the whole system. Preventing another damp storage period is more dependable than repeatedly treating the same musty bag.
Our wet-tent pack-away guide helps plan prompt drying after the next rainy trip. If the floor is sticky or peeling, use the separate tent-floor diagnosis guide before assuming odour treatment will restore it.
Continue with our tent cleaning guide.
Reviewed 10 September 2026. This guide is based on published specifications and guidance.