It is convertible season every year, and an important part of your convertible is, of course, the top. Most hardtops have been put away by now so that you can enjoy driving with the top down in nice weather. Naturally, you want your roof to look just as beautiful as the rest of your car. In this article, you will find practical tips for cleaning, protecting, and keeping your convertible roof in good condition — from bird droppings to algae, from the exterior to the interior.

What material is your convertible roof made of?

Before you start cleaning, it is good to know what your soft top is made of. The approach differs depending on the material.

Fabric/canvas (woven)

By far the most common on classics. Think of the cotton or acrylic canvas soft tops of a Triumph TR6, an old Mercedes SL, or a Fiat 500 Spider. Canvas is breathable but absorbs dirt and moisture easily. Regular cleaning and waterproofing is essential.

Vinyl (PVC)

Vinyl is harder and shinier than fabric and is found on many American and Japanese convertibles from the 1960s to the 1980s. It cleans more easily but becomes brittle more quickly with neglect and exposure to UV.

Mohair

Mohair is a premium woven fabric found particularly in British sports cars such as the Jaguar E-type and early Aston Martins. Soft, luxurious, but also delicate — beware of overly aggressive cleaning agents.

If you are not sure what material your soft top is made of, check the owner's manual or ask a specialized convertible upholsterer.

Cleaning your convertible roof

It is best to clean with neutral soap, lukewarm water, and a soft-bristled brush. Never use a brush that is too hard. If in doubt, it is better to repeat the treatment a few times than to scrub too hard. As with so many things, the same applies here: proceed with care.

After cleaning, always rinse the roof thoroughly with plenty of water to ensure no soap residue remains that could cause stains and rings. If you want to do it perfectly, rinse with filtered or distilled water. Naturally, there are also good cleaning kits on the market without aggressive ingredients — quick to order online.

If the soft top is not clean after a normal wash, you can use a mild foaming cleaner specifically suitable for convertible roofs. Work in small areas until the product starts to foam, and always rinse thoroughly afterwards. Never use unknown volatile substances or bleach — the risk of irreversible damage is high.

Tip for vinyl: after cleaning, use a special vinyl conditioner to prevent drying out and cracking.

Tip for mohair and canvas: always apply a waterproofing agent after cleaning and drying. This protects the fabric against moisture and prevents dirt from penetrating deep into the fibers.

Removing bird droppings from your convertible roof

Those winged friends sometimes even manage to hit a moving car with a precision that the average air force pilot would be envious of. Bird droppings are not only aesthetically annoying — they contain acids from berries and fruit that can damage the hood, especially in combination with temperature fluctuations.

Always remove bird droppings as quickly as possible. Use a damp cloth and place it on the droppings first, once they have hardened, so that they soften. Only then proceed carefully. Never rub dry bird droppings directly on a canvas or mohair hood, as you will literally rub the acids into the fibers.

For a soft top, it is best to gently rinse bird droppings off with lukewarm water. Then immediately throw away the cloths and wash your hands thoroughly, as bird droppings can contain germs.

Removing mold and algae from your convertible roof

Mold and algae are stubborn and dangerous for your hood — algae harden in dry conditions and cause damage and tears, particularly at the fold-over points. Once established, they return quickly if you do not remove them completely.

Always start with a special algae or mold cleaner for convertible roofs. If this is insufficient, as a last resort you can try a solution of Dettol, Biotex, or green soap — but always test this first on a small, inconspicuous area. With Biotex, the water must not be too hot, otherwise the enzymes will become inactive. Always use a soft brush and rinse thoroughly.

Beware of green soap: there are online discussions about whether green soap attracts algae due to its greasiness. It has traditionally worked well on canvas if you rinse thoroughly, but if in doubt, it is better to choose a product specifically made for this purpose.

In doubt? Then consult a specialist. Mold that is too deep in the material cannot always be saved with home remedies.

Cleaning the inside of your convertible roof

The inside of a soft top is often overlooked, but is at least as important. Mold on the inside is more insidious: you see it later and it is closer to the interior.

In most cabriolets, the interior is lined with a softer fabric, sometimes Alcantara or a woven lining. Work here with extra care:

• Use a solution of lukewarm water with a small amount of mild soap or a special Alcantara/fabric cleaner.
• Work the fabric with an extra soft brush or a soft cloth in small circular motions.
• Do not rub hard — preferably repeat the treatment several times
• Rinse with a damp, wrung-out cloth (no running water on the inside).
• Let the hood dry completely before folding it up — preferably on a warm, dry day.

As a preventative measure, you can place dehumidifiers in the car when it is parked. Leaving the windows slightly ajar also helps to promote circulation.

Mineral filter: prevent white streaks and limescale stains

When washing and drying your classic car, you are likely to see white streaks or limescale stains on the roof and windows. This is limescale (magnesium and calcium) from tap water that remains behind during drying. Filters on the hose or pressure washer filter out these minerals, preventing staining. A small investment that saves you a lot of cleaning work.

Keeping your convertible roof in top condition: storage tips

Good maintenance starts at the storage facility. A few golden rules:

• Never fold down your hood if it is not completely dry. Drying while folded is a recipe for mold and permanent creases.
• Do not park under trees. Tree sap, resin, and seeds are sticky, acidic, and difficult to remove.
• Always remove bird droppings immediately — do not put it off until the next wash.
• Keep your hood closed as much as possible. This is the natural tension of the hood and keeps it in top shape.
• Use a protective cover for long-term storage. This protects the hood against dust, UV, and moisture.
• Ensure ventilation in the storage area. Stagnant, damp air is the greatest enemy of a soft top.
• Apply waterproofing agent regularly — especially to canvas and mohair. This is a must after every thorough cleaning.

Professional cleaning

For those who find all this too much work: there are professional cleaning companies that even use steam to restore a convertible roof to top condition. This can be the best option, especially for stubborn mold or a neglected top. A specialized convertible upholsterer can also assess whether the top needs replacing.

The most important advice: prevention is better than cure. Clean regularly, waterproof after every wash, store dry, and ventilate. Then a good convertible top will last for decades. Happy cruising!