Melting honey stains on house walls or roof lines is caused by an established beehive or one that has been exterminated and left in the structure. Some pest control companies have been sued by home owners regarding damages and staining caused from not removing the beehive, perhaps the pest technician is unaware of the problem, or the bees were mistaken for wasps or yellow jackets.
Many pest control companies do not get rid of honeybees of perform structural bee removal. Pest control companies that do exterminate honeybees, typically have the customer sign a waiver to release them from liability of a exhausted beehive in the home or structure and informing them of the need of getting rid of the leftover honey and dead bees.
Some people believe this information should be given prior to exterminating the beehive. This way the home owner has time to consider options and solutions for opening the structure removing the eradicated hive and honeycomb, while then repairing and warranting the structure against future bee problems.
If you have melted honey running down the wall of your house, you have a beehive, or a beehive has been exterminated and now the honey is melting. Honey can run down the walls sometimes long after the actual eradication. If you do not get rid of the honey or remove the honey, you typically end up with long term problems. A bee hive or exhausted bee hive tends to attract returning bees as well as insects, rodents and critters.
Here are some basic bee hive removal services. Occasionally houses that are going up for sale on the market have had beehives killed but not removed. Selling or buying a house after exterminating a beehive without removal of the beehive can lead to legal problems and recurring bee problems for the new owners.
Some time ago I spoke with a home owner that had purchased and installed a new AC unit in a very large house as the old one performed poorly. Once installed and running however, the AC still performed very poorly. Upon furthe inspecting the attic they realized that rats had eaten holes through the air ducts (rats need AC too). Actually the rats were initially attracted by a beehive that was exterminated and left in the attic. When you get rid of bees (preferably alive) be sure to remove the honey as well. For help in the US call the help hotline and rate your call.