Toxic substances are substances capable of causing harmful effects under particular exposure conditions. The identity, amount and route of exposure matter.
What this means at your property
An unknown residue should not be identified as harmless or toxic solely by smell or color. Product records, event history and an appropriate assessment can help determine how it should be handled.
What should a cleanup request include?
Provide known product names, labels and the location of the material without entering a restricted area to collect them. Ask who will evaluate unknown substances and what work must wait for that evaluation. Health concerns require medical advice.