Those salt stains will not likely clean up with just some water, soap and polish. That salt has worked its way into the leather. You'll usually find that salt stains in poorly cared for shoes, no matter how many times you wet and wipe away the surface salt and then polish them, will reappear within the day. You can try to apply some vinegar to draw the salt out of the leather and really recondition and treat that leather; but it still may not fully return to its original luster and quality. I know because, back when I was a heathen, I ruined a pair of dress shoes that way. Salt never came out completely, despite repeated valiant attempts by my shoe shine. I wouldn't pay $20 for those. Save the $90 towards a better cared for pair.