I cleaned my GDF-100-4. Got this watch two days ago from a private seller, picked it up in person. It was very dirty. A quick rinse didn't really do much, so I did a proper cleansing today.
GDF-100-4 without bezel. Still very stylish. But the buttons turn on their axis, so you can't really wear it without the bezel
The crystal and case before the cleaning. Yuck.
After cleaning. Just a rinse and polish, didn't dare to submerge it due to the sensor being exposed.
The bezel got a nice dish-soap bath. It is now as-new. The "TI" from "ALTI-THERMO" on the right side of the bezel did need a bit of tootbrush action.
There was some gunk on the inside of the band, nothing a cotton swab can't remove.
Obligatory post cleaning wrist-shot. The red is a bit washed out here due to the lighting and camera (phone).
Pretty much a brand-new watch now. There is a small mark on the band from where the clasp rests, but I have the same wrist-size as the previous owner so you can't see it when I'm wearing it. The clasp has some scuffs, but no scratches, not even micro ones. And the back plate has some dings and scratches, but nothing serious. Small stuff. I'm very happy with it.
Watch is highly recommended. The inverse LCD is very sharp and large, and that the LCD has four lines is useful (i.e. current time in all modes). Fits nicely on a 6.7" flat-top wrist, better than my GD-X6900. Sure, it has some downsides, like the lack of solar/atomic and the missing top-right button, but I got it for one-third of retail and for that kind of money I don't mind. I'm not going to write more about it, Sjors already did a wonderful piece.
So what G-Shock related activity did you do today?