I know this has nothing to do with NFM portlights but the Rigid 6 Gallon wet dry vacuum, from Home Depot, at $39.00 is a great investment for working on your boat! I actually got rid of my big shop vacuums and now have three of these 6 gallon models. One for the barn, one for the garage and one for the boat!! It's tiny, powerful and easy to lug up and down ladders.
I always ditch the hoses that come with shop vac's and visit a local vacuum shop for an adapter and about 20 feet of central vac hose. This makes using a cumbersome shop vac a pleasure. The home attachments are better too. The horse hair brush (pictured) is one of my favorites. Within 25 minutes I had totally cleaned my interior of all the routing dust with the horse hair brush and the central vacuum hose.
I love this combo, so I thought I'd share.