Master Germ and Odor Removal applied their antimicrobial germ shield to our roof boxes to reduce germ transfer. 
Because our boxes go EVERYWHERE, there is a huge opportunity to bring different germs and strains of viruses back from someone's journey. Luggage usually goes into the box, then back out onto a hotel luggage cart, to the floor of a hotel room, and then to the cart, the floor of the lobby, and back into the roof box, transferring microbes and pathogens with the luggage. 
Check out the results from the antimicrobial germ shield after six weeks! They are stunning. During this period, 3 families used the box. From AZ to Ohio and back, to  Oregon and back, and to Mexico and back.
Any number below 30 on the ATP meter (the generally accepted tool for measuring germ levels) is considered by industry standards as food safe. Put another way, it is likely safer for you to make a sandwich on our roof box than in your own kitchen, which would probably test in the 600-850 range. 
Incredible performance from the single application, non-toxic antimicrobial germ shield. 
Rent Roof Box Guy roof boxes with confidence that we are absolutely doing our part to minimize germ transfer. 
(disclaimer: Master Germ and Odor Removal is owned by your favorite roof box guy. Clients include The AZ State Bar Association and LabXpress. Ask about our monthly subscription service that saves 20% on the cost of treatment for your school, church, or business).

...a product that would get down in to the indentations better. Two products were suggested that are more sprayable. I tried Silk Shine dressing and Natural Shine dressing. These also worked very well, keeping the color looking good, and the Thule roof boxes went out looking fresh and new. I have gone through many bottles of both of these, but Silk Shine is my clear favorite because it sprays on, evens out quickly, and doesn't give a super-shiny gloss that looks fake. It does an awesome job of keeping the boxes looking brand new, protecting against road grit and damage from the sun's UV rays. 
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The only downside for me is needing to do it every time the boxes go out and come back. I use a lot of these products, and the store sells the products at full MSRP, so it gets expensive to treat the boxes every week. The store associate says I can reapply daily if I'd like--maybe he didn't understand my concern at the mounting costs of spraying a fleet of roof-mounted Tupperware on a weekly basis. A 16 oz bottle would do two boxes for a month if I was conservative and never used a clean applicator sponge. Of course, that sponge gets dirty dirty dirty. When a box comes back, I wipe it down with a clean, wet towels, scrub the front and underside a bit extra for the extra bug-bits, and then treat it with the UV protection dressing. When a customer is set to pick up a box, I give it another spray of protectant to make the box look awesome and ensure the box is protected from the elements on the road.

Any thoughts on a product to use that would last for 6+ months? It needs to protect against UV rays and road elements, especially on the front of the box where many a bug has crossed over the rainbow bridge. 

On-going maintenance continues. Detail Day has gone the way of used equipment--most of my older boxes have been transitioned out of the rental fleet and replaced with brand new boxes, so the trick is to get them protected right away when we take them out of their box and bag that they ship in. I'm wide open to suggestions. I'm also wide open to product sponsors who want to test and have their products featured. People are impressed with our standard of maintenance, so I brag about Chemical Guys.