Actually, I am starting to believe that it is the Obenauf's Heavy Duty LP that is protecting my 875 from denim stains. I am constantly pairing this pair of 875 with a Naked & Famous Raw Denim Jeans, Weird Guy to be exact. As you can see from the white soles, there are obvious denim stains. BUT! The impact on the leather is minimal.
I've seen many bad denim stains on the 875 and similar but I am so glad mine is still kept to the minimal damage. (keeping fingers crossed!)
And on that bombshell, here is the family shot again: