White Goop

Alas, I have been remiss in updating my conservation pages. I picked up a pair of those boots several years ago. The powdery substance on my pair of boots (identical to Ed's) appeared to be mildew and possibly wax or salt efflorescence as well. Powdery mildew can be surface removed by gentle brushing with a soft toothbrush. This should be done outdoors to avoid spreading the spores around your home or collection room. I then treated the leather with Lexol leather conditioner. Lexol is a 2 part leather treatment system that works well with most military quality stiff leather. It should not be used on thin leather such as gloves or suede.
So far, 2 years later, the mildew has not returned.
Never use saddle soap on leather or vinegar to remove mildew.