North Hills has been a member of the Drycleaning & Laundry Institute (DLI) for many decades. The DLI has been the premier international trade association for garment care professionals since 1883. They have an excellent website that includes FAQs about drycleaning, so we suggest you go to this link:
At the bottom of that page, check out the “Ask the Expert” menu it is intended for consumers and is very informative. If you do not find an answer to your particular question, just click the “Contact Us” menu button above and email us your inquiry. We will do our best to respond promptly.