Can I restore the natural colour of wooden cladding that has turned grey?

Products such as Osmo Wood Reviver Gel (6609) can help to restore the natural colour of timber. This said, the process involves scrubbing the gel into the cladding and rinsing off with lots of water after around 15 minutes. This may not be practical for large areas of wooden cladding. An alternative is to use a coloured or pigmented UV resistant exterior wood oil to restore the colour such as Osmo UV Protection Oil Extra.