I doubt  you did that with the sprayer  it looks  just everyday wear  and stuff being stacked on it as  already mentioned  I use an air compressor to blow the loose  the dirt off  then    blue foam cleaner  and water and a  tooth brush  to get down into the tooling grooves .   the foaming helps lift the dirt .  and brush gently  for the  really stubborn dirt down in the tooling grooves I use a hand held pump srayer and on the tightest setting  and squirt  the dirt out .  then let it dry out completely at room temp this can take several days depending on the humidity, after its completely dry I will put a product like Bic 4  on it restore the fats in the leather   don't saturate  the leather with oil   light  coats  for restorations . If its a work saddle  the power washer works just stay back a little . the water wont hurt the leather  as long as you let it dry out and replace the fats in the leather without saturating it.