Oak bifolds - maintenance

[essayer]

Our doors are about 4 years old now and need a bit of tlc. They’re south facing and quite exposed.

The sill has a few dark patches now, the doors themselves are OK except for the lower rails(?)



I have a tin of Osmo UV 420 which I guess I can finish with, but what about removing the dark stains etc?

[essayer]

Cheers - will try rubbing it back a small amount,, it’s only on the areas that get foot traffic, kids etc

So for the rest of it, do I just go straight over the existing with one coat of the Osmo oil?

Why didn’t I do this a month ago