II can do better than advise you, I can quote Trickers as I have asked them. Search for champagne and you'll find my Stow boots picture not more than a few pages back... This is their email reply:
"Our leather expert has advised the following for the care of your boots:-
Any loose dirt should be removed with a water damped cloth – don’t use any spirits or solvents.
This type of waxed suede is designed to scuff and scratch up in wear.
Use a soft brush to clean the uppers."
That is all they sent me! For what it is worth, I gave mine a gentle going over with Saphir suede cleaner, using the enclosed soft brush applicator, and then revived the fibres with a brass suede brush. Then a generous blast of the Saphir suede protector aerosol spray in neutral. I went with the brown laces.
. Warning: Spoiler! (Click to show)
Wonderful, thank you. I already got some grass stains on the toe of one boot and didn't want to make it worse.
And yes, those are in fact your Stows a few pages back! Mine are very similar in colouring but not exactly the same shade as yours, though that's probably just be the lighting in the photo. Right now I have the dark brown laces that came with the pair but after seeing yours I might switch to a gray pair as the brown ones definitely stand out.