Use cold water not hot to remove it
Egging is probably a bunch of chavs using it as an excuse to cause trouble .
IMHO if you are old enough ( nowadays) to trick or treat without a grown up with you, you are too old to do it.
Not a believer but Halloween is not a pagan culture ( in Christian terms) it is supposed to celebrate the recently. Dead . The people knocking on doors were supposed to receive gifts in exchange for praying for the dead. The trick part is an American invention from the 1930's
Next time offer sweets, but open the door wearing nothing but tiny leopard print tight underwear, and invite the kids in. They will run away and never come back.