I tossed my slippers in the rubbish bin in the airport as I left Hilo. Work only asked that I have foot wear, I wore sandals. Mainland work asks that I look professional despite crawling under desks and around filthy wiring cabinets.
Wife forced me to purchase these shoes last summer, I resisted but she found some nice shoes. I wanted something that I could be very comfortable in. A lot of dress shoes lack functionality and I hate them.
I wiped off the dirt with a wet cloth, then rubbed in Lexol that I got from my leather guy. This will keep them strong like bull for a while longer.