"Navigation, sail changes, engine maintenance, etc. are all part of the rich tapestry of the cruising life, but an iced-up freezer willl eventually get your attention - a squeak like a gecko caught in an electric fan which I had been ignoring (as you do) got so loud that I finally identified it ... the fan blades were fighting a losing battle with an iced-up wireguard and there could be only one end, with ransom money for Wayne or Charlie from Ice Cold Refrigeration ooming - no worries:
!. Unload freezer and put contents into supermarket freezer bags.
2. Point $15 fan-heater into freezer, turn it on and stand back.
3. Pour a small scotch, and wait 20 mins by which time all traces of ice, frost, cold etc. will have disolved into H2O.
4. Reverse 3.2. & 1.
5. Put everything back and turn freezer on.
Works for me ☺ "