Learn all you can about your product. You have to be very careful with some of this stuff. If you splatter it on any painted surfaces it will cause spots (ex. siding of house). Also, make sure you water the grass surrounding the deck to help dilute any overspray, again the chemicals can kill grass.

You will want to avoid application in direct sun at high noon in the middle of summer. You may have to work small areas at a time. If you spray the whole deck, the product may dry out before you are done.

The better products I have seen are a multi-step process. Strip one day, clean next day, let dry 24-48 hours and apply finish. The over night fixes are just that. New decks that were never finished weather to a gray color, and yes you can apply a cleaner to restore the deck. Some of these cleaners provide a finish, which would be acceptable.

Check the warranty offered by the product suppliers as well as the method of application. Some you can spray on, roll on, or brush on. If you do not apply it accordingly you void out the warranty. Hope this helps.