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Yes, limewash on brick can accumulate dust over time. Its porous nature can attract dust particles, especially in environments with high levels of dust or dirt. Additionally, if the limewash surface is left unsealed, it may be more prone to collecting dust. Additionally, incorrectly applied limewash will generate dust. Causes include applying it too thickly instead of thin layers and not allowing enough drying time between layers. Regular maintenance, such as gentle cleaning or dusting, can help mitigate dusty issues.

Some cracking in bricks is normal, such as when a foundation settles. Keep a watchful eye though, and alarm bells should start ringing if new cracks appear or existing cracks lengthen or widen. Temperature changes, moisture, and structural loading can all contribute to cracks in bricks either starting or getting worse.

In some cases, black stains on brick are caused by organic substances like algae and mold. However, it's more likely that the black spots you're noticing on your bricks come from carbon from vehicle exhaust or soot. Black stains can usually be removed by scrubbing the brick with a brush and masonry cleaner or power washing.

You can use a regular drill to make pilot holes for gutter brackets in the wooden fascia board around the top of your house, but it’s not the best tool for brick. Instead, you’ll need a heavy-duty power tool like a hammer drill with a carbide tip bit.