For new boots follow the procedure as specified on the Whalley Warm & Dry leaflet in the link at the bottom of Post #10.
Altberg boots tend to have a minimal quite dry finish to the leather when brand new and I would recommend applying a couple of thin coats of a good quality leather conditioner all over the boot including the soft nubuck ankle cuff if they have one and tongue (inside and out) before you start the waxing regime recommended by Whalley Warm & Dry.
https://www.ebay.co.uk/itm/Grangers-Leather-Conditioner-odours-from-all-Sportswear/402062296177If you're trying to revive your existing boots give them a thorough wash and scrub under running water, allow to dry naturally then try using something like White Spirit or Isopropyl Alcohol to try to remove as much of the remaining existing polish from them as you can before you begin applying the wax. Again I would recommend applying a couple of thin coats of a good quality leather conditioner all over the boot including the soft nubuck ankle cuff if they have one and tongue (inside and out) before you start the waxing below.
Remove the laces then apply a couple of thin coats of Leder Gris Xtreme to the whole boot and really work it down into the leather with your fingers before brushing them vigorously. The more you can work the oils contained within the wax down into the fibres of the leather the better it will work and put some life back into the leather. There should be no wax visible on the surface of the leather when you've finished - less is more so spread it as far as it will go.
Following that apply 2 or 3 thin coats of the Leder Gris Original to the whole boot and really work it down into the leather with your fingers before brushing them vigorously. Again there should be no wax visible on the surface of the leather when you've finished - less is more so once again spread it as far as it will go. With the Leder Gris Original you may find it helps to warm the tin (on a radiator) to soften the wax a bit before applying it.
From then on after each wet walk give them a quick clean under running water, allow to dry naturally until the leather is just slighly damp then apply a thin coat of Leder Gris Xtreme across the flex point and the tongue followed by a thin coat of Leder Gris Original all over the boot.