depends on HOW MUCH ice is in the bilge...
My last boat was a Hunter 29.5 with a very deep bilge. The last year I had it, the bilge filled almost to the top (i.e. with LOTS of water). I tried ethylene glycol in a panic...did nothing. So, I purchased a heat gun and sat in the boat for about 5 hours, melted the ice down to my bilge pump, hand pumped it out, went home, and poured myself a good stiff drink. Luckily, nothing was damaged, and I bought a new boat. In the middle of winter on the hard, a heat gun works fine if you have a lot of time...good luck!