How To Clean A Trailer How Can I Remove Mould Spores And Clean Dirty Marks From My Canvas Trailer Tent And Waterproof It?

How can I remove mould spores and clean dirty marks from my canvas trailer tent and waterproof it? - how to clean a trailer

I have a store of aging trailers stored outside of the obvious (not parking). It has some mold spores on and it smells a little musty. It also has some marks from dirt and grease stains. How do I clean the fabric (not nylon) and Trademark Office, as well as mold and water resistant?