Ive been treating the H&Hs seats with saddle soap conditioner since the day I bought it 6 years ago.
Saddle soap has different properties than regular leather conditioners and is used, as the name suggests, in the equestrian field mainly for saddles and riding boots. It has Excellent waterproofing qualities and it seems to make the leather a lot firmer yet subtle, if that makes sense. After applying it generously I normally let it sit overnight then polish it next am. Have been doing this every 6 months and am really impressed with the results. It doesn’t give that gash bright sheen or sticky residue either.
We use it on the daily driver Landcruiser seats and that gets a hammering what with dogs and kids hopping in and out etc...
Just thought I would pass it on now that spring cleaning thoughts may be entering your heads.