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Guide · 1 min read

Mold vs mildew: how to tell the difference

Flat and powdery, or fuzzy and growing into the wall? The difference decides whether it’s a wipe or a job.

People use the words interchangeably, but mildew and mold are different problems with very different price tags. Telling them apart tells you whether this is a five-minute wipe or a remediation job.

Mildew

Mildew is a surface fungus — flat, powdery, usually white, gray, or yellowish. It sits on top of damp surfaces (tile grout, shower walls, fabric) and wipes off with a household cleaner. It doesn’t grow into the material.

Mold

Mold is three-dimensional — fuzzy, slimy, or raised — and comes in green, black, or other colors. It grows into porous materials like drywall and wood, which is why removing it often means cutting material out, not just wiping.

Quick test
Wipes off and doesn’t come back? Mildew. Leaves a stain, smells musty, or returns? Treat it as mold.

Why the difference matters

Mildew is a cleaning task. Mold is a remediation cost — and if it’s dark and slimy, check the signs of black mold before you touch it.