I just found the rule in the SRD :
So, yes, if you treat the web as a damageable object, you can blow it away with any energy damage. It's just that fire will work best (because of the flammable aspect described in the spell description), then sonic, then acid and lightning, and finally cold which will do only 1/4 damage.
All you'd need is to house rule a hardness and hit points value for the webbing.
Objects take half damage from acid, fire, and lightning attacks. Divide the damage by 2 before applying the hardness. Cold attacks deal one- quarter damage to objects. Sonic attacks deal full damage to objects.
So, yes, if you treat the web as a damageable object, you can blow it away with any energy damage. It's just that fire will work best (because of the flammable aspect described in the spell description), then sonic, then acid and lightning, and finally cold which will do only 1/4 damage.
All you'd need is to house rule a hardness and hit points value for the webbing.