How long has it been since you've made ANY cage adjustments?
For Pongo's stuck head shed try Methods 1 or 3...
especially Method #3:
#4---Humidity Chamber Assists for Stuck Shed: Leopard Geckos & Crested Geckos
Be sure to monitor your gecko at all times during these procedures.
Place your gecko in a Humidity Chamber for an hour or so to loosen stuck shed on eyes, toes, and/or body.
If the eyes have retained shed, gently flush them with a normal saline solution. Fill a small squeeze bottle with a contact lens wetting solution such as Blink for Contacts NOT a contact lens CLEANER. Aim the flow towards the eyes. Alternatively, saturate a small sterile gauze pad with normal saline. Gently hold this against the eyes for several minutes.
If these methods are ineffective or if there is any sign of infection, prompt vet attention is necessary!
METHOD #1:
Temperatures no greater than 86*F/30*C, a leopard gecko's preferred body temperature.
Take a plastic container a little bigger than your gecko
Poke breathing holes in the lid so that your gecko can breathe
Place a dampened paper towel or washcloth on the bottom of this container
Add a rough rock or piece of cork bark
Spray the insides of this container
Add the gecko
Snap on the lid
Place this container near a lamp (or other low heat source) using a low wattage bulb (15 watt or 25 watt incandescent bulb or similar wattage compact fluorescent) to further increase humidity
Monitor the temperature frequently
Monitor your gecko at all times
After an hour or two, perhaps longer, remove the gecko and gently attempt to remove the stuck shed using a gentle rolling motion with a wet q-tip.
Some folks place this covered container containing the leopard gecko into shallow warm water to generate the desired humidity.
Depending upon the amount of retained shed, this procedure may need to be repeated on several successive days.
METHOD #2:
Use water at about 86*F/30*C, a leopard gecko's preferred body temperature.
Fill a shallow basin or the bathroom sink with lukewarm water to your gecko's belly depth.
Let your gecko soak for about 20 minutes.
Then take a wet q-tip, and with a gentle rolling motion, work on the toes. Use tweezers gently.
This should definitely loosen any shed remaining on the critter's toes.
METHOD #3:
Wrap the gecko in a wet washcloth with just the snout and eyes visible.
Firmly hold gecko in place for 15-20 minutes. Remove wrap.
Test the skin gently to see whether it has loosened up enough for removal.
If not, try wrapping again for another 15 minutes.