Hi. We have just pressure washed our wooden decking. Not sure of age but smooth rather than ridged. Pale wood, feels warm to bare feet. It's come up well but we're hesitating over putting any products on it. Does it have to be stained/waxed/varnished? If so, what sort of product/application method is most effective? Dreading hours of brush and sponge work...Many thanks for any advice