When the windshield washer fluid is insufficient, water can be added temporarily, but selection should be made cautiously based on weather conditions. Given the year-round high temperatures and heavy rainfall, it is advisable to prioritize dedicated washer fluid over plain water, as the latter lacks detergents and lubricating agents. In emergencies where water must be used, distilled water is preferable to minimize nozzle clogging from mineral deposits, though proper washer fluid should be replenished promptly afterward. When refilling, locate the reservoir marked with a windshield/umbrella symbol in the engine bay, ensuring not to exceed the MAX line or introduce contaminants. Seasonal variants include mosquito-repellent formulas (rainy season) and antifreeze solutions (high-altitude regions), typically priced between RM8-RM25 per 1.5L. Assessing foam density by shaking the bottle provides an initial indication of cleaning efficacy.