Does anyone have a favourite decking treatment? I spent 5 hours jet washing my decking today and I'm only halfway done. It's 13 years old but holding up pretty well, there's one or 2 bits that need attention but overall I'm happy with it. I guess it should be treated every year but its such a large area it takes me a few days to jet wash and stain it so it only gets done every few years. Does anyone apply with a spray gun? roller? pad? etc.