I hate to say it, but you probably have to climb down in there with a hair dryer and mop it out with a sponge a little at a time.
Where's the water getting in? I realize that it's too cold for bedding compounds to cure, but maybe you can cover that area or something?
My port jib track needs rebedding so the rain seeps in, runs down the quarterberth liner and into the bilge. Luckily, all the precipitation has been frozen so once I mopped out the bilge, it's stayed dry.
Is it possible to lay down butyl tape and then heat it with a hair dryer to get it to ooze into place properly?
S/V Old Shoes
1973 Pearson 30 #255