Some substances are classified as GRAS simply because they have been used for years and no one has bothered to test them. An example was seen in the news recently. It was found to cause cancer in test animals. It may not be safe to ingest and it certainly is no guarantee of safety by inhalation. 10 Common Sense Rules Ask lots of questions when you buy products and services.
Good salespeople selling good products have good answers.
They also should have documentation to back their claims. Ask for it. Investigate natural and biodegradable products with the same vigor that you would synthetic and non-biodegradable ones. If solvents must be used, get their material safety data sheets. See Table on page 16 for a few examples of TLVs.