a week ago
You might find this information from Cabots interesting about why there's no clear (colourless) decking oils. They say the reason all exterior decking oils have pigment (stain) in them is due to the colour being the component which provides protection from Australia’s harsh Ultra-Violet radiation. Screening out UV helps to protect the timber surface, and prevent degradation. Bare timber left in the sun will go grey and eventually cup, crack and splinter.
I'm sure other community members will be happy to make suggestions, but you might also find these previous discussions useful:
When did the new deck go down?