Is this spot on my floor mold?
Unexplained residue on an attic floor can look like spilled coffee, causing immediate worry that the substance might be mold. This uncertainty leaves people guessing what the spot actually is and how best to clean it.
Overview
People affected2 accounts across 2 forums
Workarounds found5 items attempted
Community agreement5 total upvotes
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
5 items+ Contribute
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1Scraping the spot with a plastic or cheap metal scraper to test if it comes up solid, and using a standard mold spray from a hardware store.Did this help you?
- 2Sprinkling baking soda, scrubbing, and spraying with white vinegarDid this help you?
- 3Drying the sink with a towel after cleaning to prevent water spotsDid this help you?
- 4Scrubbing the drain to eliminate potential mildewDid this help you?
- 5Cleaning the sink and monitoring if the spots returnDid this help you?
Tried another approach not listed above?+ Share your workaround ↑
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
r/CleaningTips1 person · October 2026
r/HomeMaintenance1 person · October 2026
“I recently found this on the floor in my attic. Is it mold? Best way to clean it? Thanks in advance!”source ↗
Brewersfan300 · r/HomeMaintenance · 2 upvotes
Where this came up
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