What it is. A buildup of dust and grime.
How it forms. Dust and grime accumulate over time.
Appearance. Yellowish or brownish.
Location. Anywhere in the house.
Cause. Lack of cleaning.
Clean-up. Use a general-purpose cleaner.
4. Rust
What it is. Rust from metal fixtures.
How it forms. Rust can drip down from metal fixtures.
Appearance. Orange or brown.
Location. Often near metal fixtures.
Cause. Water and metal.
Clean-up. Remove the rust and repair the fixture.
5. Mold or Mildew
What it is. Mold or mildew growth.
How it forms. Mold and mildew thrive in damp environments.
Appearance. Yellow, green, or black.
Location. Often in bathrooms.
Cause. Moisture.
Clean-up. Use a mold and mildew cleaner.
6. Sap
What it is. Tree sap.
How it forms. If you have a house near trees, sap can drip down.
Appearance. Yellow or brown.
Location. Outside or near windows.
Cause. Trees.
Clean-up. Use a specialized cleaner.
How to Determine the Cause
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