Outdoor covers are the unsung heroes of the Australian backyard. They work quietly in the background — shielding BBQs from storm events, protecting furniture from UV, keeping vehicles clean between uses — and in return, they often receive no maintenance attention at all until the day they fail.

The result is predictable: a cover that could have lasted 4–6 years deteriorates in 18–24 months, losing its waterproof performance, developing mildew on the underside, cracking at seam points, and eventually failing to protect the item it was bought to cover.

This guide explains how to properly care for Oxford cloth outdoor covers — the most common material used in quality outdoor protective covers — so they perform at their best for as long as possible.

Why Oxford Cloth Covers Need Active Maintenance

The Waterproof Coating is the Weak Link

The body of an Oxford cloth cover — the woven polyester fabric itself — is inherently quite durable. The woven structure, especially at 420D density, is resistant to tearing, UV degradation, and abrasion for years.

The PU (polyurethane) waterproof coating, however, is more vulnerable. This coating is applied as a polymer layer over the inner face of the fabric, and it deteriorates through:

• UV exposure — the coating absorbs UV energy and breaks down at the molecular level, eventually becoming tacky, brittle, and prone to flaking or cracking
• Biological degradation — mildew and mould grow on PU coatings when moisture is trapped against the surface for extended periods, physically degrading the coating layer
• Mechanical stress — repeated folding in the same place, pulling from secure straps, and abrasion against rough surfaces all create micro-cracks in the coating that admit moisture

Maintenance activities that protect the coating are maintenance activities that protect the cover's most important function.

Mildew is the Most Common Cover Killer

Mildew — a surface fungal growth — is probably the single most common cause of premature cover failure. It develops when:

• A cover is stored while still damp
• A cover is left on damp equipment for extended periods without airing
• A cover is stored in a poorly ventilated location (garage corner, storage box) without periodic inspection

Once established, mildew creates visible discolouration (black or grey spots on the inner surface) and physically degrades both the fabric and the coating. In advanced cases, mildew penetrates the weave and cannot be fully removed.

Prevention is vastly simpler than remediation.

How to Clean Your Oxford Cloth Outdoor Cover

Routine Cleaning (Monthly or After Heavy Contamination)

What you'll need: Soft brush, mild detergent, clean sponge, garden hose, shade drying location

1. Remove the cover from the item and lay flat on a clean surface, inner face down
2. Brush off loose debris — leaf matter, surface grime, bird droppings. Use a soft brush (not wire) to avoid abrading the outer surface
3. Pre-rinse with cool water — this removes surface salt deposits and loosens stubborn dirt
4. Apply mild detergent solution (a small amount of dishwashing liquid in a bucket of cool water is adequate; avoid bleach, fabric softener, or solvent-based cleaners — all damage PU coatings)
5. Gentle scrub with a sponge — circular motion, medium pressure. Pay particular attention to seam areas where grime accumulates and bird dropping spots where acid may have begun to mark the fabric
6. Rinse thoroughly — detergent residue left on the fabric promotes UV degradation. Rinse until water runs completely clear
7. Air dry completely in shade — never machine dry; the heat will destroy the PU coating. Allow several hours of airflow on both sides before storing or replacing

Deep Cleaning for Mildew (As Required)

If mildew spots develop on the inner face:

1. Mix a solution of one part white vinegar to four parts cool water
2. Apply to mildew-affected areas with a sponge and allow to sit for 15 minutes
3. Scrub gently with a soft brush
4. Rinse and air dry thoroughly in bright (but not direct) sunlight — UV actually assists in killing surface mildew organisms

Note: Heavily mildewed covers may not fully recover appearance, but this treatment will arrest further biological degradation of the fabric and coating.

Re-Waterproofing Treatment (Annually or When Waterproofing Diminishes)

Over time, even with proper care, the PU coating loses performance. The test: pour a small amount of water onto the outer surface. If it beads and runs off, the coating is performing. If it soaks in and darkens the fabric, the coating is degraded.

Apply a fabric waterproofing spray (DWR — Durable Water Repellent) specifically rated for polyester Oxford cloth. These sprays are available from camping and outdoor equipment retailers. Apply per the product instructions to a clean, dry cover surface.

This treatment restores water repellency and adds a thin barrier layer that also slows further UV degradation of the underlying PU coat.

Storage Best Practices

• Never fold tightly along the same lines repeatedly. This creates permanent crease lines where the coating cracks. Instead, loosely fold along different lines each time, or loosely roll the cover.
• Store in a dry, ventilated location. A breathable storage bag (often supplied with quality covers) is ideal. Sealed plastic containers trap humidity.
• Store covers separately from dirty or chemical-contaminated items. Covers stored in contact with oil, fertiliser, or fuel vapours can absorb these compounds into the coating, accelerating degradation.
• Inspect at the start of each season. Check seams for fraying, elastic for perishing, and coating for cracking or delamination. Small repairs to seams and re-waterproofing treatments done early are far more effective than allowing deterioration to advance.

The Maintenance Dividend

A well-maintained outdoor cover lasts 4–6 years in Australian conditions. A neglected cover — stored while damp, cleaned infrequently, folded in the same creases — may fail in 18 months. The maintenance routines described above take less than an hour per year total across a typical backyard cover set.

Shop Cacatua's range of outdoor covers at cacatua.com.au — all covers use UV-stabilised PU coating and double-stitched seams for maximum service life. Dispatched from Melbourne.