Dust and hard water can leave deposits that slow photosynthesis, but don’t believe everything you read about using acids to remove them The problem Dusty leaves are more than a cosmetic problem. A film of dust blocks light, which slows photosynthesis and dulls the plant. Hard water makes it wor...
Source: [Guardian International](https://www.theguardian.com/lifeandstyle/2026/sep/08/houseplant-hacks-can-white-vinegar-or-lemon-juice-clean-leaves)