Car Care During Nairobi's Long Rains

Nairobi's long rains run from roughly March to May, and the short rains pick up again from October through December. Together, those two wet seasons cover almost half the year. And every year, we see the same pattern at our Karen workshop: cars that were pristine in February arrive in June looking dull, water-stained and occasionally with real damage to the paint and interior.

Rain itself doesn't damage cars. But what the rain leaves behind — and what it hides — does. Between the wet-dry cycles, the hard water deposits, the humid interiors and the mud-packed undercarriages, Kenya's rainy season is genuinely one of the toughest annual challenges your car will face. This guide walks you through what to do before, during and after the rains to keep your car in excellent shape.

What rain actually does to your car

To protect your car properly during the rains, it helps to understand what's actually causing the damage:

Before the rains: preparation that pays off

The best thing you can do for your car during the rains is prepare it properly before they start. If you're in late February or early March, this is the time to act:

✓ Apply ceramic coating or a quality sealant

This is the single biggest preparation you can make. A ceramic coating or quality sealant creates a hydrophobic layer that makes water bead and roll off — reducing mineral deposits dramatically and making regular cleaning far easier. If you're considering a coating, do it before the rains, not during them: high humidity during cure can affect the final result.

✓ Replace wiper blades

Worn wiper blades are one of the biggest safety issues in rain. If your blades are more than 12 months old, or streak on a wet windscreen, replace them before the rains. It's one of the cheapest things you can do for safety.

✓ Check and treat rubber seals

Door seals, boot seals, sunroof seals and windscreen rubber. Apply a rubber conditioner to keep them supple and prevent water ingress. Cracked seals let water into places it should never reach — carpets, footwells, and electrical connectors.

✓ Restore your headlights

If your headlight lenses are yellowed or cloudy, restore them before the rains. Reduced visibility in rain is far more dangerous than in dry conditions. Restored lights also look dramatically better.

✓ Book a full detail before the season starts

Enter the rains with a clean, protected car. This means a fresh coating or wax, clean glass, conditioned interior, and no existing water spots or contamination that the rain will only make worse.

✓ Install rubber floor mats

Carpet mats and wet shoes are a terrible combination. Rubber mats are easy to remove and hose down. If you have fabric mats, change them for rubber during the rains and store the fabric ones.

During the rains: weekly habits

Once the rains begin, a few weekly habits will keep your car in good shape. Here's what we recommend:

✓ Wash after each heavy rain

This might sound excessive, but it's the most important habit of the season. Every time rain dries on your paint, it deposits minerals. If you wash within a few days, those deposits come off easily. If you let them sit and re-form over weeks, they start etching into the clear coat. You don't need a full wash every time — a quick rinse and dry-down is enough to prevent the worst of it.

✓ Dry the car thoroughly after washing

In the rainy season this is doubly important. Never let the car air-dry. Use a large plush microfibre towel and dry the whole car — including door shuts, boot shut, and under the wheel arches where water pools.

✓ Clean the undercarriage regularly

Mud packed into wheel arches and underbody panels holds moisture against metal. A monthly undercarriage wash removes the buildup and lets the metal dry properly. In heavy rains, especially after murram driving, do it more often. This is one of those invisible services that saves a lot of future rust damage.

✓ Manage interior humidity

A few simple habits keep the cabin fresh through the rains: shake out umbrellas before entering the car, wipe down wet seats and carpet as soon as possible, and run the air conditioning on the "fresh air" setting regularly to reduce humidity. Once every week or two, leave the windows cracked for an hour in the sun to let the cabin breathe. This single habit prevents most of the musty odour problems we see in June.

✓ Check the boot and spare wheel well

Boot seals fail. When they do, water collects in the spare wheel well and the boot floor — and it can go unnoticed for months, quietly rusting the metal and causing mould. Every couple of weeks, open the boot, lift the floor panel, and check for moisture. If you find any, dry it thoroughly and get the seal checked.

After the rains: corrective care

When the rains end — late May and again in late December — your car will have accumulated some wear. This is the corrective phase, and it's where professional help is worth paying for:

• Watermark removal — the single most important post-rains service. Removes mineral deposits before they become permanent. From KES 3,500 (targeted) to KES 8,000 (full car).
• Interior deep detail — cleans out the accumulated humidity damage, removes any mould spores, and refreshes the cabin for the dry season. From KES 8,500.
• Undercarriage wash and inspection — removes mud buildup and lets us spot any corrosion that started during the season.
• Wheel and brake cleaning — removes wet brake dust and any kerb-rash damage that occurred during the season. From KES 4,500.
• Paint decontamination + wax/coating top-up — iron fallout and tar removers clean the paint back to bare clarity, then a fresh sealant or booster prepares the car for the dry season. From KES 5,500.

The mistakes that cost the most

Every rainy season, we see the same avoidable mistakes. Don't let them happen to your car:

Frequently asked questions

The bottom line

Nairobi's rains are unavoidable, but the damage they cause is entirely manageable. The keys are simple: protect the paint before the season starts, wash regularly through it, keep the interior dry, don't ignore the undercarriage, and book a proper post-rains detail in May and December. Do those five things and your car will come through the season looking the same as it went in.

If you'd like help preparing your car for the next rains — or recovering it from the last ones — call us on 0775-358-836 or book a free inspection at our Karen studio. We'll tell you honestly what your car needs and what it doesn't.